9th Chapter 3 Force and Newton's Law Test Review

Newton's first law of motion states that __________.

• when a force acts on an object, its acceleration is in the same direction as the force

• when a force is applied on an object, there is an equal force applied by the object in the opposite direction

• an object will remain at rest or keep moving unless a force acts on it

• acceleration is calculated by dividing the force exerted on an object by the mass of the object

The __________ is the combination of all the forces acting on an object.

• direction of motion

• force pair

• inertia

• net force

__________ measures an object's tendency to resist changing its motion.

• Acceleration

• Gravity

• Inertia

• Mass

A(n) __________ is a push or a pull that one body exerts on another.

• acceleration

• force

• motion

• velocity

What happens to the weight of astronauts when they are in orbit?

• It decreases but does not become zero.

• It becomes zero.

• It does not change.

• It increases.

An example of friction is __________.

• a car rolling to a stop at a traffic light

• a baseball moving in projectile motion

• a tree standing in a field

• the free fall of astronauts on the space shuttle

When force is increased, what happens to acceleration?

• It fluctuates.

• It stays the same.

• It decreases.

• It increases.

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

Static friction occurs when two objects in contact with each other are __________ relative to each other.

• moving

• at rest

• colliding

• rolling

What happens to the gravitational force as objects get farther apart?

• It decreases.

• It stays the same.

• It fluctuates.

• It increases.