Newton's Third Law of Motion

Fill in the blanks: For every action, there is an (a)   and opposite reaction.

Tags

NGSS.MS-PS2-1

What is the reaction force to a foot pushing down on the staircase?

• A. The foot going through the stairs

• B. The staircase pushing back against the foot

• C. The staircase breaking the foot

• D. The staircase pushing against the floor below

A swimmer pushes on the water and the water pushes on the hand and the swimmer moves forward. What is the ACTION force?

• A. The swimmer pushes on the water.

• B. The water pushes on the body of the swimmer.

Tags

NGSS.MS-PS2-1

In indoor soccer, players sometimes use the wall to pass to each other. 

When the soccer ball hits the wall, the ball exerts a force on the wall. Some of this force creates a right angle toward the wall, as shown by the orange arrow. 

What’s the direction of the force exerted by the wall on the soccer ball?

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS2-1

While driving down the road, a firefly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver.

Which of the forces below is greater?

• The force of the bus hitting the firefly

• The force of the firefly hitting the bus

• No force is greater than the other.

Tags

NGSS.MS-PS2-1

An empty car on a steep street rolls downhill and collides with a concrete wall. The car is damaged, but the concrete wall isn’t.

What’s true about the strength of the forces in this situation?

• The force exerted by the car was greater because it was moving.

• The force on the wall was greater because it wasn't damaged.

• The forces exerted by the car and the wall were equal.

• No forces were exerted in this collision because the car was empty.

Tags

NGSS.MS-PS2-1