STAAR BLATZ Newton’s 3 Laws of Motion

______ An object will stay at rest or in motion unless acted on by an unbalanced force.

• 1st Law

• 2nd Law

• 3rd Law

• Law of Gravity

______ Force equals mass times acceleration.

• 2nd Law

• 1st Law

• 3rd Law

• Law of Gravity

For every action, there is an equal and opposite reaction.

• 3rd Law

• 1st Law

• 2nd Law

• 4th Law

Objects resist changes in motion.

• 1st Law

• 2nd Law

• 3rd Law

• Law of Universal Gravitation

Heavier objects need more force to accelerate.

• 2nd Law

• 1st Law

• 3rd Law

• Law of Gravity

Forces always come in pairs.

• 3rd Law

• 1st Law

• 2nd Law

• 4th Law

Newton’s 1st Law (Law of Inertia) states that:

• An object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force.

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

• For every action, there is an equal and opposite reaction.

• Objects with more mass have more gravity.

Newton’s 2nd Law states that the acceleration of an object depends on its mass and the force applied to it. Which of the following best describes Newton’s 2nd Law?

• The acceleration of an object depends on its mass and the force applied to it.

• An object at rest stays at rest unless acted on by a force.

• For every action, there is an equal and opposite reaction.

• Objects in motion stay in motion unless acted on by a force.

Newton’s 3rd Law states that:

• For every action, there is an equal and opposite reaction.

• An object in motion stays in motion unless acted upon by an outside force.

• Force equals mass times acceleration.

• Objects at rest stay at rest unless acted upon by a force.

A soccer ball does not move until it is kicked. Which law is being described and why?

• Newton's First Law; because an object at rest stays at rest unless acted on by an external force.

• Newton's Second Law; because force equals mass times acceleration.

• Newton's Third Law; because every action has an equal and opposite reaction.

• Law of Universal Gravitation; because gravity keeps the ball on the ground.