Ch. 3 Test: Forces and Newton's Laws

Forces that cancel each other are called _____ forces.

• balanced

• inactivated

• neutral

• null

How is mass different from weight?

On Earth, what is the weight of a large-screen TV that has a mass of 75 kg?

Two students push on a box in the same direction, and one student pushes in the opposite direction. What is the net force on the box if each student pushes with a force of 50 N?

• 0 N

• 50 N

• 100 N

• 150 N

Newton's second law of motion is _____.

• F = m/a

• p = m × v

• a = F/m

• p = m/v

When force is increased, what happens to acceleration?

• It decreases.

• It fluctuates.

• It increases.

• It stays the same.

The statement “to every reaction there is an equal and opposite reaction” is _____.

• the law of conservation of momentum

• Newton’s first law of motion

• Newton’s second law of motion

• Newton’s third law of motion

When a falling object reaches terminal velocity, the force of gravity _____ the force of air resistance.

• is unrelated to

• is greater than

• is less than

• equals

When an object moves in a circular path, the net force is called a(n) _________________. (2 words)

• centripetal force

• gravitational force

• frictional force

• magnetic force

How does the gravitational force change as two objects move farther apart?

• It increases.

• It decreases.

• It remains constant.

• It is zero.