Newton's Laws of Motion

What does Newton's Third Law of Motion state?

• Energy cannot be created or destroyed, only transformed.

• The force exerted by an object is equal to its mass times its acceleration.

• Objects in motion stay in motion unless acted upon by an external force.

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

Tags

NGSS.MS-PS2-1

How do action and reaction forces relate to each other?

• They occur in pairs and are always equal.

• They are directly proportional to the objects' masses.

• They only apply to objects at rest.

• They cancel each other out, resulting in no movement.

Tags

NGSS.MS-PS2-1

What example is given to illustrate Newton's Third Law?

• A rocket launching into space.

• A leaf falling from a tree.

• A ball rolling down a hill.

• Water flowing in a river.

Tags

NGSS.MS-PS2-1

What happens when a cannon fires a cannonball?

• The cannonball creates new energy.

• The cannon moves forward.

• The cannonball remains stationary.

• The cannon moves backward.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-5

If a boxer punches a punching bag with 50 pounds of force, how much force does the bag exert in return?

• 75 pounds of force

• 50 pounds of force

• 25 pounds of force

• 100 pounds of force

Tags

NGSS.MS-PS2-1

What is static friction?

• The friction between two non-moving objects.

• The friction that occurs when an object starts to move.

• The friction that keeps an object moving.

• The friction between two objects moving in opposite directions.

What is sliding friction compared to in the text?

• Leaves blowing in the wind.

• A car braking to a stop.

• Rubbing your hands together to generate heat.

• Ice melting under pressure.

Why is less energy used when friction is reduced?

• Because objects become lighter.

• Because the objects move faster naturally.

• Because the gravitational pull is weaker.

• Because less force is needed to keep the object moving.

Tags

NGSS.MS-PS3-5