Section 3.4
1. Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply.
a. The object experiences a force which has a component directed parallel to the direction of motion.
b. Inertia causes objects to move in a circle.
c. There can be a force pushing outwards on the object as long as the net force in inwards.
d. Because the speed is constant, the acceleration is zero.
e. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle.

Answers C&E
C is true; an object which moves in a circle must have a net inward force. There are many instances of individual outwards forces which are exceeded by an individual inward force
E is true; if the net force is 0 N, then the moving object will maintain its state of motion. At the instant that Fnet becomes 0 N, the object is moving tangent to the circle. Section 4.2
2. Which of the following statements are true of inertia? List all that apply.
a. Inertia is a force.
b. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity.
c. Inertia is a force which brings all objects to a rest position.
d. All objects have inertia.
e. A more massive object has more inertia than a less massive object.
Answer: D&E
d. True - Any object with mass has inertia. (Any object without mass is not an object, but something else like a wave.)
e. True - Mass is a measure of an object's inertia. Objects with greater mass have a greater inertia; objects with less mass have less inertia.
Section 5.1
1. Which of the following are never true of an object that is at equilibrium? Include all that apply.
a. The object is accelerating.
b. The object is moving in a circle at constant speed.
c. All the forces