# Rotational Motion Chapter Exam

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### Page 1

#### Question 1 1. Which of the following is a correct definition of rotational motion?

#### Question 2 2. Why are light bulbs measured in watts (power) instead of joules (work)?

#### Question 3 3. Which of the following is NOT a rotational kinematics quantity?

#### Question 4 4. Which of the following defines the parallel axis theorem?

#### Question 5 5. 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?

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#### Question 6 6. A 10000 kg satellite orbits Earth at 5000 m/s. It is at 1.65 Earth radii, where the radius of the earth is 6371 km. What is the satellite's angular momentum?

#### Question 7 7. The moment of inertia around a parallel axis will always be _____ the moment of inertia around the center of mass axis.

#### Question 8 8. 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 9 9. What is the angular equivalent of 'position'?

#### Question 10 10. A spinning top increases the rate at which it spins from 5 radians per second, at an angular acceleration of 3 radians per second per second. If it continues to accelerate for 4 seconds, what will the final angular velocity be?

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#### Question 11 11. 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?

#### Question 12 12. A spinning top is spun at an angular velocity of 3 radians per second, by applying a torque of 10 newton-meters. How much power is being transferred to the spinning top?

#### Question 13 13. Which of the following defines ROTATIONAL inertia?

#### Question 14 14. A merry-go-round is pushed with a torque of 500 newton-meters, around an angle of 2-pi radians. How much work is done in this process?

#### Question 15 15. If it wasn't for friction or air resistance, what would happen to a spinning top?

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#### Question 16 16. What is the difference between kinematics and dynamics?

#### Question 17 17. How do we know that rotating objects have kinetic energy?

#### Question 18 18. Which of the following is a correct definition of moment of inertia?

#### Question 19 19. A spinning top is spun at 720 degrees in five seconds, by applying a torque of 10 newton-meters. How much power is being transferred to the spinning top? Note: 180 degrees is equal to pi (3.14) radians.

#### Question 20 20. 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?

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#### Question 21 21. As you move the rotation axis closer to the (parallel) center of mass axis, what happens to the moment of inertia?

#### Question 22 22. What is the definition of angular velocity?

#### Question 23 23. A certain disk has a moment of inertia of 1000 kg⋅m2. What torque would be required to get it to spin from rest to 10 revolutions-per-second in 0.5 sec?

#### Question 24 24. Instead of mass (used in translational motion), what do we use in the equation for rotational kinetic energy instead?

#### Question 25 25. Which of the following is NOT an example of torque in the real-world?

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#### Question 26 26. Which of the following people has the most linear momentum?

#### Question 27 27. What is rotational kinetic energy?

#### Question 28 28. A spinning top has a moment of inertia of 2 kilogram meters squared. How much torque does it take to accelerate it at a rate of 10 radians per second per second?

#### Question 29 29. Which of the following is the rotational version of Newton's 1st Law?

#### Question 30 30. What happens when a spinning ice-skater with arms outstretched brings her arms close to her body?

#### 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!