Newton’s Third Law

Newton’s 3rd law states that for every action, there is an equal and _______ reaction.

• balanced

• opposite

• unbalanced

Tags

NGSS.MS-PS2-1

Forces always occur _______.

• in the same direction

• alone

• in pairs

Newton’s 3rd law is also known as the law of _______.

• inertia

• action & reaction

• force & acceleration

Tags

NGSS.MS-PS2-1

A rock on the ground weighs 40 N. How much force does the ground exert on the rock?

• 20 N

• 0 N

• 40 N

Tags

NGSS.MS-PS2-4

Based on Newton’s 3rd law, the force pairs always act on _______.

• different objects

• the same object

• objects in motion

Tags

NGSS.MS-PS2-1

The bat hits a ball. What is the reaction force?

• gravity pulling the ball down

• the ball hits the bat

• air resistance slowing the ball down

Tags

NGSS.MS-PS2-1

You sit in a chair. You push the chair down. What is the reaction force?

• Gravity pushes the chair up.

• The chair pushes you down.

• The chair pushes you up.

Gravity pulls a skydiver down as air friction (drag) pushes the skydiver up. Is this an action-reaction pair?

• No, because both forces are acting on the skydiver.

• Yes, because there are two forces involved.

• Yes, because the forces are equal and opposite.

A bug hits a windshield. The force of the bug on the windshield is _______ the force of the windshield on the bug.

• greater than

• less than

• the same as

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Although the forces are equal, the bug gets squished because it has less _______ and a soft body.

• friction

• speed

• mass

Tags

NGSS.MS-PS2-2