Forces and Motion

Which illustrations show contact forces causing a change in motion?

• 
• 
• 
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Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Clara moves two bar magnets so that the north “N” pole of one magnet is near the south “S” pole of the other magnet.

What force, if any, do the magnets apply?

• Push

• Pull

• Push and Pull

• Neither

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What kind of force is gravity?

• a pulling force that acts only when objects touch the ground

• a pulling force that acts at a distance between objects and the ground

• a pushing force between objects and the ground below them

• either a pulling force or a pushing force, depending on the size of an object

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

A baseball player uses a mitt to catch the ball. What causes the ball to stop moving?

• the contact of the mitt pushing on the ball

• the contact of the mitt pulling on the ball

• 
  the force of the mitt pulling the ball from the air

• the force of the mitt pushing the ball from the air

A basketball is bounced on a gym floor. When is gravity pulling the basketball downward?

• only when the basketball is moving downward

• only when the basketball is moving upward

• when the basketball meets the floor, but not other times

• at all times, whether or not the basketball is moving

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

A boy drops two rocks at the same time.

If air does not affect them, will the large rock fall faster than the small rock? Why?

• 
  Yes; Gravity makes larger objects fall faster.

• Yes; Gravity makes heavier objects fall faster.

• 
  No; Gravity makes all objects fall at the same rate.

• No; Gravity stops acting on objects when they fall.

Tags

NGSS.MS-PS2-4

Naomi wants to demonstrate that two objects can push each other away, even when they are not touching. Which would be most useful for her demonstration?

• a long rope

• a ladder

• two bar magnets

• two soccer balls

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Frank and Zoe are both pushing a large crate. However, the crate is not moving.

Which change would most likely set the crate in motion?

• Both Frank and Zoe pull the crate instead of pushing it.

• Frank pulls the crate while Zoe keeps pushing it.

• Both Frank and Zoe push twice as hard.

• Zoe moves next to Frank, and she pulls on the crate while Frank pushes it.

Tags

NGSS.MS-PS2-2

Sylvia is investigating how pulls affect the motion of a wagon.

What would be most useful to observe or measure about the wagon as she pulls it? Select two answer choices.

• the shape of the wagon

• the color of the wagon

• the speed of the wagon

• the direction the wagon is moving

• the number of wheels that are rolling on the wagon

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Meeka states that gravity can act at a distance. How can she best demonstrate this statement?

• She can push a heavy object across the floor.

• She can try to lift a heavy object off the ground.

• She can toss a baseball into the air and watch it rise and fall.

• She can roll a soccer ball across the grass and watch it slow down.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5