AP Physics 1 - Unit 2: Newton's Law Review

Three objects can only move along a straight, level path. The graphs show the position d of each of the objects plotted as a function of time t. The sum of the forces on the object is zero in which of the cases?

• II only

• III only

• I and II only

• I and III only

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Two people are pulling on the ends of a rope. Each person pulls with a force of 100 N. The tension in the rope is:

• 0 N

• 50 N

• 100 N

• 141 N

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A ball initially moves horizontally with velocity v_i, as shown to the right. It is then struck by a stick. After leaving the stick, the ball moves vertically with a velocity v_f, which is smaller in magnitude than v_i. Which of the following vectors best represents the direction of the average force that the stick exerts on the ball?

• 
• 
• 
• 

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A student pulls a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following must be true?

• P > f and N < W.

• P > f and N = W.

• P = f and N > W.

• P = f and N = W.

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An object is thrown with an initial speed v near the surface of Earth. Assume that air resistance is negligible and the gravitational field is constant. If the object is thrown vertically upward, the direction and magnitude of its acceleration while it is in the air is

• upward and decreasing

• upward and constant

• downward and decreasing

• downward and increasing

• downward and constant

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A tractor-trailer truck is traveling down the road. The mass of the trailer is 4 times the mass of the tractor. If the tractor accelerates forward, the force that the trailer applies on the tractor is

• 4 times greater than the force of the tractor on the trailer.

• 2 times greater than the force of the tractor on the trailer.

• equal to the force of the tractor on the trailer.

• ¼ the force of the tractor on the trailer.

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A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?

• 0.37 newtons

• 3.75 newtons

• 37.5 newtons

• 375 newtons

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A homeowner pushes a lawn mower across a horizontal patch of grass with a constant speed by applying a force P. The arrows in the diagram correctly indicate the directions but not necessarily the magnitudes of the various forces on the lawn mower. Which of the following relations among the various force magnitudes, W, f, N, P is CORRECT?

• P > f and N > W

• P < f and N = W

• P > f and N < W

• P = f and N > W

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A crate of toys remains at rest on a sleigh as the sleigh is pulled up a hill with an increasing speed. The crate is not fastened down to the sleigh. What force is responsible for the crate’s increase in speed up the hill?

• the contact force (normal force) of the ground on the sleigh

• the force of static friction of the sleigh on the crate

• the contact force (normal force) of the sleigh on the crate

• the gravitational force acting on the sleigh

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An object originally traveling at a velocity, v₀, is accelerated to a velocity, v, in a time, t, by a constant force, F. What would be the mass of the object?

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