Ch 3: Forces and Newton's Laws

Front

Newton's first law of motion states that __________.

Back

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

Front

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

Back

net force

Front

What measures an object's tendency to resist changing its motion?

Back

Inertia

Front

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

Back

force

Front

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

Back

It decreases but does not become zero.

Front

The best example of friction is __________. Options: 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

Back

a car rolling to a stop at a traffic light

Front

When force is increased, what happens to acceleration?

Back

It increases

Front

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

Back

equals

Front

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

Back

at rest

Front

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

Back

It decreases