# Systems of Particles & Rotational Motion Chapter Exam

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Question 1
1.
A *moment* is very similar to

#### Question 2 2. What is the unit for a moment?

#### Question 3 3. What theorem deals with the sum of individual moments on an object?

#### Question 4 4. Which of the following people has the most linear momentum?

#### Question 5 5. A planet is orbiting a star in a perfect circle. It has a velocity of 4x10^4 m/s, a mass of 3 x 10^24 kg. If at a particular moment it's orbiting at a radius of 2 x 10^11 meters, how much angular momentum does it have?

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#### Question 6 6. What is the angle between the velocity and radius of an object moving in a perfect circle?

#### Question 7 7. What is the center of gravity of an object?

#### Question 8 8. What is the center of mass of an object?

#### Question 9 9. When are the center of gravity and center of mass not in the same place?

#### Question 10 10. What is the angular variable that corresponds to the linear variable 'time'?

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#### Question 11 11. Which of the following is NOT a rotational variable?

#### Question 12 12. If the initial angle of a turntable compared against an arbitrary line is 20 degrees, and half a second later it has rotated to 370 degrees, what is the angular velocity of the turntable?

#### Question 13 13. If a force of 10 newtons is applied at a distance of 5 meters from a pivot point, what torque does this produce?

#### Question 14 14. Which of the following is a correct definition of torque?

#### Question 15 15. Why is it easier to open a door by pushing a long way from the hinge?

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#### Question 16 16. A 1 kg solid rubber ball moving at 50 m/s strikes a light wooden plank. 2/3 of the initial kinetic energy of the ball is transferred to the wooden plank making it spin in a vertical circle at 10 Hz. Determine the moment of inertia of the wooden plank.

#### Question 17 17. Which of the following is a correct definition of moment of inertia?

#### Question 18 18. Imagine a ball rolling down a hill without friction. To measure the moment of inertia, which of the following is NOT a measurement you would need to take (or figure out)?

#### Question 19 19. Which of the following shows the correct relationship between torque and angular momentum?

#### Question 20 20. Which physical quantity is the equivalent of force for rotational motion?

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#### Question 21 21. What do we call a measurement of an object's ability to resist angular acceleration?

#### Question 22 22. Which of the following is a correct definition of rotational inertia?

#### Question 23 23. As you move the rotation axis closer to the (parallel) center of mass axis, what happens to the moment of inertia?

#### Question 24 24. A non-symmetrical object has a moment of inertia of 0.75 around a center-of-mass axis, and a total mass of 6 kilograms. If the object is rotated around a parallel axis 0.3 meters away from the center of mass axis, what is the moment of inertia of the object?

#### Question 25 25. The following are individual moments on a lever: 3 Nm into the screen, 1 Nm into the screen, and 5 Nm out of the screen. What is the net moment on the lever?

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#### Question 26 26. Which of the following is a correct definition of moment of inertia?

#### Question 27 27. For a bowling ball, how far apart are the center of gravity and center of mass?

#### Question 28 28. If the angular velocity of a spinning disk is 6 radians per second, and four seconds later it is 20 radians per second, what is the angular acceleration of the disk during that time?

#### Question 29 29. A mass of 3 kilograms, and a mass of 6 kilograms are placed at different points on a seesaw until they balance perfectly. If the 3 kilogram mass is 0.5 meters from the pivot point, how far away is the 6 kilogram mass?

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Question 30
30.
Use the following data from a repeat of the ball experiment, to figure out the moment of inertia of a second ball:

Mass of the ball: 1 kg.

Radius of the ball: 0.02 meters.

Height of the hill: 0.3 meters.

Translational velocity at bottom: 2.2 m/s

Rotational velocity at bottom: 80 rads/s

#### Systems of Particles & Rotational Motion Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!