Reading Quiz

Question 1:

Answer:

1. a)Momentum is the measure of an objects translational motion, it tendency to continue moving in a particular direction. It indicates which direction it is heading and hot difficult ot is to get the object to move with its current velocity. b)The connection between momentum and inertia is that momentum is an objects tendency to continue moving in a particular direction, and inertia is very simular because it says that an object that is moving will continue to move in a constant direction if it is not affected by an outside force. c)Impulse is a force exerted on an object for a certain amount of time. Impulse is responsible for transfering momentum.
2. Momentum is the measure of somethings translational motion, how it keeps moving in a specific direction. Inertia and momentum are both when an object continues to stay in motion. Impulse is a force acted on something for a certian amount of time.
3. Momentum is the measure of somethings translational motion, how it keeps moving in a specific direction. Inertia and momentum are both when an object continues to stay in motion. Impulse is a force acted on something for a certian amount of time.
4. (a) Momentum is an object's tendency to continue moving in a particular direction. (b) Inertia explains why objects have momentum. (c) Impulse is the force exerted on an object for a certain amount of time. Impulse tranfers momentum from one object to another.
5. Momentum is the measure of something’s translational motion, how it keeps moving in a specific direction. Inertia and momentum are both when an object continues to stay in motion. Impulse is a force acted on something for a certain amount of time.
6. a) momentum is an object's translational motion, or its tendency to keep moving in a specified direction. momentum = mass x velocity b) inertia states that a body in motion tends to stay in motion while a body at rest tends to stay at rest. The inertia of a car makes it both difficult to start and stop and difficult to spin or stop from spinning. The book says that these two kinds of inertia are associated with linear momentum and angular momentum--but I'm not sure exactly how. c) impulse is a force exerted on an object for an amount of time; it transfers momentum to this object. impulse = force x time
7. a. momentum is the measure of an object's translational motion b. inertia is the tendency of an object to continue moving in a direction at a steady pace. momentum is just the tendency of an object to continue moving in a direction, not necessarily at the same pace. c. impulse is the force exerted on an object for a certain amount of time. It is the means for transfering momentum.
8. a) momentum- the measure of an object's translational motion (momemtum=mass x velocity) b) momentum is a quanity of inertia; it measures inertia's effect on an object, they are both conserved quanitities c) impulse- a force exerted for a certain amount of time (impulse= force x time), an impulse gives an object momentum
9. a.)Momentum is an object's tendency to remain in motion. It is found by multiplying mass(kg) by velocity(m/s). b.)Since inertia is really the mass of an object, momentum is just the inertia times the velocity. c.)Impulse is change in momentum, and equals the force exerted on an object times time.
10. Momentum is the measure of an object's translational motion, or its tendency to continue moving in a particular direction. Inertia is the property of matter in which it remains at rest of in motion unless acted on by a force, while momentum is the vector quantity that measures motion. Impulse is the means for transferring momentum. It exerts a force on a second object for a period of time, and in return the second object exerts an equal and opposite force on the first object.
11. a) momentum is p. it's an object's tendency to continue moving in a particular direction b) momentum is the inertia of a moving object. c) impulse is a force exerted on an object for a certain amount of time.
12. Momentum is the measure of an objects translational motion- its tendency to continue moving in a certain direnction. It is determined by mass times velocity. Momentum is connected to inertia because momentem is what an object has to keep it in motion. An impulse is what transfers momentum and it is found by multiplying the force exerted on a second object times the time.
13. a) Momentum is a vector quanity, the measure of an object's translational motion, which can be found by multiplying mass times velocity. b) Inertia is the property that causes momentum. It's the tendency of an object to retain its motion in a straight line path or remain at rest. c) Impulse is the change in momentum, found by multiplying the force exerted on it times the length of the push.
14. Momentum is a vector quantity of motion, which means that it has both magnitude and direction, that is conserved. Momentum is in the same direction as the velocity of an object. There is a direct relationship between inertia and momentum. An object with more inertia will have more momentum as it moves, meaning it will be harder to stop (or harder to get moving from rest). Impulse is the force that transfers momentum from one object to another.
16. Momentum is an object's tendency to continue moving in a particular direction. Momentum is equal to mass times velocity. It is not related to inertia because momentum is a conserved quantity that measures an object's motion and inertia is a property governing an object's motion (one measures, one does not). An impulse is a change in momemtum. It is found by taking torque times time. Impulses change an object's momemtum by transferring it from one object to another.
17. It is the tendency of an object to continue moving in a given direction. Its relationship ship to inertia is that inertia is the concept that an object in motion will remain in motion, and so momentum is essentially a way of measuring an object's inertia. Impulse is the force given to an object for a certain amount of time that gives it a new momentum.
18. Momentum is the tendency to continue moving in one direction. This relates to intertia since inertia holds that an object in motion tends to stay in motion unless acted upon by some outside force, and momentum measures an object's tendency to do so. Impulse is a force exerted during a given time, it is the product of force multiplied by the amount of time. Impulse is the means by which momentum is transferred.
19. (a) Momentum (linear momentum) is the measure of an object's translational motion- its tendency to continue moving in a particular direction. (b) Inertia says that something at rest will remain at rest and something in motion will remain in motion, unless acted upon by some force. The connection between this and momentum, is that when an object experiences inertia, such as an object that is moving in a continual linear motion, we can measure its translational motion, which is what momentum is. (c) Impulse is the mechanical means for transferring momentum. An object gives an impulse to another object by exerting a force upon that object for a certain amount of time.
20. Momentum: measure of an object's translational motion, the tendency to continue moving in a direction. Momentum and inertia are the same idea for moving objects. They tend to stay in their motion unless acted on by an outside force. Momentum can be transfered by impulse, whereas inertia cannot.
21. (A)Momentum is the measure of an objects translational motion. (B)I am not entirely sure the answer to this question. I always thought that inertia and momentum were the same thing. (C) An impulse is a force that is exerted on an object for a certain amount of time. Impulses transfer momentum from one object to another.
22. (a) Momentum is is the quantity of an object's translational motion - its tendency to continue moving in a particular direction. (b) Inertia is an object's tendency to stay in motion once in motion, and a characteristic of momentum, which is a vector quantity of its mass times its velocity. (c) Impulse is the measure of the amount of force that acts over a period of time. Impulse changes the momentum of a body.
23. Momentum is the measure of a tendency of an object to continue moving in a direction. Momentum is related to inertia in that momentum makes an object continue moving in a direction and inertia is the tendency for the object to stay in motion as long as no other forces act on it. Momentum also measures the amount of force it takes to overcome an object's inertia. An impulse is the amount of force exerted on an object over a certain period of time. An impulse is what gives an object momentum.
24. a) Momentum is the measure of an object's translational motion, it is a conserved quantity and is transferred by an impulse. b) momentum and inertia both deal with an object's tendency to continue moving without any outside forces acting on it. c)Impulse is how momentum is transferred; it is a force exerted on an object for a certain amount of time.
25. Momentum is the measure of an object's translational motion. It related to inertia in that it measures an object's tendency to continue moving in a certain direction. An impulse is a force exerted on an object for a particular amount of time.
26. Momentum is the measure of an object's translational motion (its an object's tendency to continue moving in a particular direction). Inertia is a property of matter by which it remains at rest or in uniform motion in the same straight line unless acted on by some outside force, which is similar to an object's momentum because it is moving in a constant particular direction. Impulse is a force exerted on it for a certian amount of time. Impulse is the mechanical means of transfering energy.

Question 2:

Answer:

1. I feel that i pretty much understand the concept, but it might be helpful if you went over a different example (something other than the bumper cars) of these rotational analogs.
2. no, i think i understand it now.
3. no, i think i understand it now.
4. I don't have any questions about it right now.
5. no, i think i understand it now.
6. I don't have any questions about them.
7. I think they make sense. It is the same thing only in a circle instead of a straight line.
8. No questions.
9. a.) Angular momentum is an object's tendency to keep it's rotational motion. It is found by multiplying rotational mass by angular velocity. b.) Rotational inertia an objects tendency to remain in motion, which is rotational mass times angular velocity. c.)Angular impulse is change in momentum, the torque exerted on an object times time.
10. None.
11. no confusion, i think it's pretty clear.
12. nope.
13. no questions
14. All the concepts remain the same from translational motion when applied to rotational motion. So angular momentum is directly related to rotational inertia, and angular impulse is the torque (which is the result of a force) that transfers angular momentum.
16. nope
17. No, the parallels between these different quantities make a lot of sense.
18. No I understand them.
19. I think it would be good to go over them in class.
20. no
21. I dont think i have any questions regarding these concepts, however it would help me to learn them better if we talked about them in class, and the formulas related to them.
22. No questions on rotational quantities.
23. I have a pretty good understanding about the rotational concepts and how they relate and differ to the linear concepts.
24. No, I saw the correlation right away and it was very easy to guess the corresponding angular equations from the previous linear equations.
25. not currently.
26. Angular momentum is the measure of an object's rotational motion; its tendency to continue spinning about a particular axis. Rotational inertia is a property of matter by which it remains at rest or in steady rotation about the same rotational axis unless acted on by some outside torque. Angular impulse is a torque exerted on it for a certain amount of time. Angular impulse im not sure about.

Question 3:

Answer:

1. An acrobat cannot stop himself from spinning while he is in mid air because they have such a migh angular momentum that it is hard for them to stop spinning until they pass on their angular momentum to another object, which in this case is the ground.
2. While he is in the air, his angular momentum remains constant keeping him in motion , therefore he can't stop in midair.
3. While he is in the air, his angular momentum remains constant keeping him in motion , therefore he can't stop in midair.
4. The acrobat is unable to get rid of his angular momentum because in the air he has nothing with which to exchange angular momentum. Thus the angular momentum given to him at his launch continues to stay with him and he continues spinning.
5. While he is in the air, his angular momentum remains constant keeping him in motion, therefore he can't stop in midair.
6. Rotational inertia tells us that it is difficult to stop an object from spinning. The acrobat is experiencing angular momentum, a quantity that cannot be created or destroyed. It can only be transferred between objects. The acrobat is experiencing zero net torque so his angular momentum stays constant and he continues spinning.
7. There is nothing that he can exchange his angular momentum with.
8. The angular momentum of the acrobat is a conserved quanitity. It cannot be created or destroyed and can only be transfered. In midair, there is no where for the angular momentum to go, so the acrobat keeps spinning.
9. An acrobat has rotational inertia, so he can't stop himself because there is nothing like friction in contact with him to transfer his momentum to.
10. The acrobat would have to overcome the force of his angular momentum, which would be very difficult to do while in the air.
11. Because the acrobat has nothing with which to exchange angular momentum while in the air.
12. The acrobat has angular momentum so he will spin until he meets with another object and angular momentum is transfered.
13. He has angular momentum and he has no way to exert an impulse in midair to stop that momentum. He could spread his arms wide and adjust the distribution of his rotational mass, which would slow down his spin.
14. An acrobat cannot stop himself from spinning while he is in midair because of his rotational inertia and his angular momentum. Without any outside torque applied to him, he will tend to remain in motion rotating. Therefore as the acrobat is freely falling, there are no outside forces on him to apply a torque to alter his motion in the direction of slowing his rotation down. In this case, the force of gravity actually does cause a torque to increase his angular acceleration.
16. In order to stop spinning, he would need to transfer his angular momentum into another object or counteract his spin (like the guy on ice who threw his shoe). He can't just get rid of it because momentum has to be conserved. Since he's in midair, there are no other objects he can use to assist him in stopping his spin, and he does not have enough time to move his body in a way that would counteract the spin he is in.
17. In order to stop spinning he would have to exert a force or impulse upon something else to change either his rotational or translative motion, and since there is nothing that he can physically push off of or transfer his energy into he is stuck moving in that particular motion until he reaches the ground or comes into contact with something else.
18. The acrobat's own roational mass and his angular velocity gives him an angular momentum while he is in the air. Angular momentum is a conserved quantity, so it can neither be created nor destroyed, only transferred between objects. The acrobat will continue spinning until he can transfer this momentum to something else, like when he lands on the ground.
19. This is beacuse, when the acrobat is spinning in mid air, there are no outside torques which means the acrobat has constant angular motion.
20. HIs angular momentum keeps him spinning, as no outside force is acting upon him. He cannot stop, as there is nothing to use force on him to stop the spinning.
21. An acrobat cannot stop himself from spinning in midair because there is no way for him to apply a force that would counter act his spinning while he is in the air. He can however speed up or slow down his spin by curling into a tighter ball or spreading out as far as possible. This would change his rotational mass.
22. An acrobat can't stop himself from spinning while in midair because he has no other object to transfer his rotational momentum to.
23. This happens because the acrobat has no way of applying an angular impulse while in midair. This would be the only way he could stop his spinning, applying a angular impulse in the opposite direction.
24. Because he has rotational momentum and their are no outside forces colliding with him other than the air or gravity. Therefore, he will continue to spin until something changes his momentum. Also, he will usually rotate or flip with his body in a ball and by doing this he makes his rotational mass closer to his center of mass which will make him spin even faster.
25. Because in midair, he has zero net torque. This means that he will have a constant angular momentum, and not be able to stop himself from spinning.
26. His mometum is too great for his own force to stop him from spinning.

Question 4:

Answer:

1. Possibly give examples of how and what type of problems we would be asked to solve relating to momentum. Why would you want to calculate the impulse?
2. Could we go over the concept of impulses?
3. Could we go over the concept of impulses?
4. Would you talk about impulse the same way you would talk about a force? i.e. "An impulse is acting on the object"?
5. Could we go over the concept of impulses?
6. See question 1, how intertia is related to momentum.
7. I think everything made sense.
8. None :)
9. none
10. Nothing
11. is momentum the inertia of a moving object? i couldn't really tell.
12. i found the difference between energy and momentum a little difficult to grasp.
13. equal and opposite forces, what happens to the moving object during the collision?
14. I think I got everything from this section.
16. -
17. I feel comfortable with everything from the reading.
18. I did not really understand check your understanding #1, the "stuck on the ice" question. Can we also talk about angular impulse in class?
19. I found the rotational mass talk on page 70 to be kind of confusing.
21. I didn't find anything in particular to be too confusing.
22. The difference between transfering energy and transfering momentum, as exemplified in check your understanding number 5, is a bit confusing to me.
23. Maybe spend a little time clarifying impulses, I have a general idea but am hazy on the details.
24. I think I understood pretty much everything from the reading...I may want to go over Newton's rotational laws of motion a bit because sometimes the wording is confusing.
25. none. It was really helpful to do the group exercises with the whole class involved (like we did on monday) instead of breaking up into pairs. I learned a lot more this way because you could lead us in the right directio and explain what was happening, yet we were still involved.
26. The torque equations.

Question 5:

Answer:

1. Could you possibly give us another example like you did in class with the see saw, and determining where a child should be placed in order for it to balance out.
2. nothing at this time
3. nothing at this time
4. I am still not sure about question 2 from reading quiz #6. I was confused about how potential energy came into account or if there was any. I always used to think that potential energy was the opposite of kinetic energy, so if kinetic energy is decreasing because it's slowing down, is potential energy increasing? Looking at the other answers people gave didn't help much because there were a variety of responses.
5. nothing at this time
6. None.
7. nothing
8. None
9. none
10. I understand everything pretty well at this point.
11. nothing
12. i think im good with the stuff from previous classes
13. none
14. I'm okay with everything at this point.
15. -
16. Still feel like I have it all under control.
17. I think I am clear on previous material.
18. I think it would be helpful to go over all the conserved quantities.
20. I feel confident that i know all the material from previous classes fairly well. I do find it helpful, however, to apply formulas and concepts we have learned previously, so they stay fresh in my mind. I think this is especially useful before a test or quiz.
21. I'm okay with past material, thanks.
22. None
23. I understood everything in class.
24. none
25. Ramps