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GACE Physics: Rotational Motion Chapter Exam

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!

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Question 1 1. 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 2 2. 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 3 3. Which of the following defines ROTATIONAL inertia?

Question 4 4. What is the angular variable that corresponds to the linear variable 'time'?

Question 5 5.

In a question, you're given the initial angular velocity, the angular acceleration, and the change in angle and asked to calculate how long it took to accelerate. Which equation should you use to solve this problem?

(Note: In the images below, w0 is the initial angular velocity, and w is the final angular velocity. This is another way of notating the same thing, which you may well see in problems and tests.)

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Question 6 6. What is the definition of angular velocity?

Question 7 7. 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 8 8. Which of the following is NOT a rotational quantity used in physics?

Question 9 9. Which of the following is a correct definition of moment of inertia?

Question 10 10. Which of the following quantities does not affect an object's angular momentum?

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Question 11 11. 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 12 12. Which of the following defines the parallel axis theorem?

Question 13 13. Which of the following defines inertia?

Question 14 14. If it wasn't for friction or air resistance, what would happen to a spinning top?

Question 15 15. Which of the following is a full and correct definition of angular momentum?

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Question 16 16. What is rotational kinetic energy?

Question 17 17. Why are light bulbs measured in watts (power) instead of joules (work)?

Question 18 18.

Which of the following is NOT one of the big 5 equations for rotational motion with a constant acceleration?

(Note: In the images below, w0 is the initial angular velocity, and w is the final angular velocity. This is another way of notating the same thing, which you may well see in problems and tests.)

Question 19 19. Which of the following is a correct definition of rotational inertia?

Question 20 20. If a force of 10 newtons is applied at a distance of 5 meters from a pivot point, what torque does this produce?

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Question 21 21. A planet is orbiting a star in a wildly elliptical orbit. The planet has a mass of 3 x 10^4 kilograms, a velocity of 3 x 10^3 meters per second, a radius of 7 x 10^13 meters, and is orbiting at an angle of 70 degrees to the star. When the planet reaches its closest point of approach, at a radius of 2 x 10^12 meters, and an angle of 90 degrees, approximately how fast will it be moving?

Question 22 22. 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 23 23. Which of the following is a correct definition of rotational motion?

Question 24 24. What is the difference between kinematics and dynamics?

Question 25 25. How do we know that rotating objects have kinetic energy?

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Question 26 26. Which of the following is NOT an example of torque in the real-world?

Question 27 27. Why is it easier to open a door by pushing a long way from the hinge?

Question 28 28. Which of the following people has the most linear momentum?

Question 29 29. 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 30 30. As you move the rotation axis closer to the (parallel) center of mass axis, what happens to the moment of inertia?

GACE Physics: 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!

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