Forces and Newton's Laws

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

• net force
• inertia

• force pair

• direction of motion

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

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

• Inertia
• Momentum
• Force

• Acceleration

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 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

• greater than

• less than

• equal to

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

• at rest

• Moving

• Sliding

• Rolling

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

• It decreases.

• It stays the same.

• It fluctuates.

• It increases.