First Law of Motion

A force is a ________________________ that acts on an object.

• push

• pull

• push or pull

A force that opposes, or pushes back against, an object moving past another object

• gravity

• friction

• inertia

• mass

Acceleration is best described as a change in an object's

• velocity

• speed

• direction

An object at rest will stay at rest unless an unbalanced force acts on it.

• True

• False

An object's tendency to resist (not) change its state of motion.

• gravity

• force

• inertia

• friction

If an object in motion is not acted on by an unbalanced force, it will continue with the same speed and direction.

• True

• False

Which type of force(s) will cause a change in an object's motion?

• gravity
• zero net force
• balanced forces
• unbalanced forces

What is Newton's First Law

• F=ma
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion. 
• Friction 

____ is a force that occurs when an object rubs against another object.

• Motion
• Friction
• Velocity
• Speed

Which of these is an example of Newton's First Law, inertia?

• pushing against a brick wall, and the brick wall does not move
• pushing against a stationary wheelbarrow, and the wheelbarrow accelerates forward
• pushing a wheelbarrow full of bricks, and the bricks slide back toward the handles
• pushing a wagon to the top of a hill, and the wagon to the top of hill and the wagon accelerates down the hill without assistance