AP Physics Chapter 4 Quiz

The magnitude of the frictional force along the plan is most nearly

2.5N

A person is attracted towards the center of the Earth by a 500 N gravitational force. The force with which the Earth is attracted toward the person is

500N

Which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N that act on the block?

E

Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of

Newton's third law

A block of weight W is pulled along a horizontal surface at constant speed v by force F, which acts at an angle of theta with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude

W-Fsin(theta)

Two forces are applied to a 2kg block on a frictionless horizontal surface as shown below. The acceleration of the block is

a. 5.0 m/s^2 to the right b. 3.0 m/s^2 to the right c. 5.0 m/s^2 to the left d. 3.0 m/s^2 to the left e. 6.0 m/s^2 to the right

when something is in equilibrium which of the following are true:

a. all the forces acting on an object are balanced b. the sum of the +x forces on an object equals the sum of the -x forces c. the sum of the upwards forces equals the sum of the downwards forces d. the net force on the object is zero e. all of the above

You are standing in a moving bus, facing forward, and you continue to move forward as the bus comes to an immediate stop. What force caused you to continue moving forward?

a. gravity b. normal force due to your contact with the floor and the bus c. force due to friction between you and the floor of the bus d. there is not a force leading you to move forward

An object following a straight-line path at constant speed

a. has a net force acting on it in the direction of motion b. has zero acceleration c. must be moving in a vacuum d. has no forces acting on it e. none of the above

Suppose a small ship is accelerated through space by a constant 10N force. Suddenly the ship encounters a second 10N force directed opposite to the ship's force. The ship

a. is brought to a rapid halt b. gradually decreases to a halt c. continues at the speed it had when it encountered the second force d. theoretically accelerates to speeds approaching the speed of light e. none of the above

Mass and weight

are two different quantities

A stone is thrown straight up. At the top of its path, the net force acting on it is

equal to its weight

A golf club hits a golf ball with a force of 2400 N. The golf club hits the club with a force

exactly 2400 N

All accelerations are produced by

forces

After a cannon ball is fired into frictionless space, the amount of force necessary to keep it going equals

zero, since no force is necessary to keep it moving