Newton's First and Second Law

What is Newton's First Law

• the object at rest will always move

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion.

• Friction

A moving object will keep ________ unless acted on by an unbalanced force.

• at rest

• moving

• in one spot

• inertia

Which of the following best describes Newton's first law of motion?

• A) An object will accelerate in the direction of the net force applied to it

• B) An object will remain at rest unless acted upon by an external force

• C) An object will move with constant velocity if no net force acts upon it

• D) An object's momentum will change if no external forces are present

What property of matter does Newton's first law of motion describe?

• A) Density

• B) Inertia

• C) Volume

• D) Elasticity

What causes objects to move or stop moving?

• a force

• inertia

• Newton's first law

Which would be harder to move?

• a pencil

• an elephant

Which object has more inertia?

• a pencil

• an elephant

When an object does not want to change motion, it is called ________________.

• inertia

• motion

Kicking a ball is an example of ________________.

• force

• speed

What kind of objects have inertia?

• all objects with mass

• only objects in motion