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# Basics of Rotational Motion Chapter Exam

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#### Question 1 1. A disk was spinning at a speed of 2.5 radians/second and then its speed increased to 5.0 radians/second. If it takes the disk 4 seconds to speed up from 2.5 to 5.0, how far does it turn during this acceleration?

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Question 2
2.
Calculate the moment of inertia using the following data.

KE = 3,400 J

Angular velocity = 2 rotations per second

#### Question 3 3. What happens when the direction of an object in circular motion changes, but the speed remains unchanged?

#### Question 4 4. What tension do we need to put on the string of a 0.5 kg object, to spin it around in a 0.6 m radius circle, going 1.8 m/s?

#### Question 5 5. When an object is in _____, tilting it will raise the height of its center of gravity, and it will return to its normal stable state after being tilted.

### Page 2

#### Question 6 6. An object is rotating at a rate of 5 radians per second. If it takes 3 seconds for the object to reduce its velocity to 1 radian per second, what is the angular acceleration?

#### Question 7 7. Joshua is making some calculations for his science fair project. He observes a small car move in a circle and divides the angle of rotation by the time it took the car to reach that angle. What is Joshua calculating?

#### Question 8 8. Jane is using a 14 cm long screwdriver to assemble a bookcase. She applied a force of 45 N to rotate the screw 180 degrees. How much work did she do?

#### Question 9 9. A person applied a work of 25 J to a tool during a period of 2 seconds. What power did the person exert over the tool?

#### Question 10 10. You hang a flower basket using a horizontal pole, held to the wall with a bracket. If the basket weighs 0.7 kg and the pole is 40 cm long, how much torque is on the bracket?

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#### Question 11 11. Most translational quantities have a rotational equivalent. What is the translational equivalent of moment of inertia?

#### Question 12 12. What will occur when an object moves continuously around an internal axis?

#### Question 13 13. A ball is attached to a string. The ball has a mass of 13 kg and is spun in circular motion with a radius of 3 m and a speed of 4.5 m/s. What is the force of tension on the string?

#### Question 14 14. Which of the following is true for an object in stable equilibrium?

#### Question 15 15. 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.

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#### Question 16 16. Which of the following is NOT a rotational variable?

#### Question 17 17. Why is it easier to open a door by pushing a long way from the hinge?

#### Question 18 18. Which of the following is the rotational version of Newton's 1st Law?

#### Question 19 19. A car of mass 1500 kg, moves in a circle at 30 m/s. If the circle has a radius of 8 meters, what is the size of the frictional force that is moving the car in the circle?

#### Question 20 20. 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?

### Page 5

#### Question 21 21. What is the definition of angular velocity?

#### Question 22 22. In a general sense, what do we mean by conservation of angular momentum?

#### Question 23 23. What is the difference between a scalar and a vector?

#### Question 24 24. Which of the following is true for an object in neutral equilibrium?

#### Question 25 25. 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?

### Page 6

#### Question 26 26. 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 27 27. If a force of 10 newtons is applied at a distance of 5 meters from a pivot point, what torque does this produce?

#### Question 28 28. Which of the following is NOT a rotational quantity used in physics?

#### Question 29 29. Why do you feel a centrifugal force if it isn't real?

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Question 30
30.
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.)

#### Basics of 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!