Topic 2 Knowledge Check

Complete the statement below. Isaac Newton made many important discoveries about forces and gravity. These discoveries are MOST useful to people who study

• plants

• circuits

• planets

• humans

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NGSS.MS-ESS1-1

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The third law of motion is known as the law of action-reaction. Which of the following situations are an example of Newton's third law of motion?

• A player's foot pushes on a soccer ball while the soccer ball pushes back on the player's foot.

• A person pushes on the water with a floatie while the floatie pushes back on the person's hand.

• A person pushes down on a trampoline and the trampoline pushes back up.

• A car accelerates forward and the road pushes back on the tires.

Tags

NGSS.MS-PS2-1

Based on the fact that the Earth is larger and has more mass than the moon, which object has the most gravity?

• Earth

• Moon

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NGSS.MS-PS2-4

A washer is rolling across a horizontal tabletop. As it rolls, it slows down. Which of the following statements best explains this situation?

• There are no unbalanced forces acting on the washer.

• There is an unbalanced force on the washer caused by friction.

• There is no upward force acting on the book.

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NGSS.MS-PS2-2

Identify the direction and net force. Two people are pushing a box in opposite directions. One person is pushing the box with a force of 50N to the right and the other person is pushing the box with a force of 80N to the left.

• 30N to the left

• 30N to the right

• 130N to the left

• 130N to the right

Tags

NGSS.MS-PS2-2

Identify an unbalanced force:

• A rock is resting on the ground.

• A marble is rolling on the curve of the track.

• Books are sitting on the desk.

• A rug is laying on the floor.

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NGSS.MS-PS2-2

Which of the forces often effect speed and direction. In the figure above what would affect ONLY the speed of the car?

• A

• B

• C

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1