Assignment:
1. You are looking at a Ferris wheel (you see a circle) and observe that it is rotating clockwise. The direction of the rotational velocity of the Ferris wheel is? (hint use the right-hand rule)
a. directly toward you.
b. directly away from you.
c. down.
d. up
2. You are looking at a Ferris wheel (you see a circle) and observe that it is rotating clockwise with decreasing rotational speed. The direction of the rotational acceleration of the Ferris wheel is
a. directly toward you.
b. directly away from you.
c. down.
d. up
3. A clock (with hands) is flat on your desk. What direction is the rotational velocity?
a. up.
b. down.
c. Right.
d. Left
4. Newton's first law for rotational motion states that an object will maintain its state of rotational motion unless acted on by an unbalanced (or net)
a. force.
b. velocity.
c. inertia.
d. torque.
5. An object's resistance to a change in its rotational velocity is called its
a. inertia.
b. mass.
c. torque.
d. Moment of Inertia or rotational inertia.
6. A solid disk and a thin hollow hoop have the same mass and radius. Which has the larger rotational inertia?
a. hoop
b. disk
c. they are the same.
d. depends on the material the item are made of
7. A fully-loaded trailer truck is less stable than a race car because the truck
a. is more massive.
b. has a higher center of mass.
c. has bigger wheels.
d. weighs more.
8. The rotational inertia of an object increases as the mass ____ and as the distance of the mass from the center of rotation ____.
a. increases ... increases
b. increases ... decreases
c. decreases ... increases
d. decreases ... decreases
9. Under what conditions is the total angular momentum of a system conserved?
a. It is always conserved.
b. When there is no net outside force.
c. When there is no net outside torque.
d. When the kinetic energy is also conserved.
10. A change in the rotational velocity of an object is produced by a net
a. force.
b. torque.
c. rotational inertia.
d. moment arm.
11. The rotational displacement of two complete turns is equal to
a. 4π rad
b. 720 deg
c. 2 rev
d. All of the above