What explains when 2 forces are of the same strength, but act in opposite directions, like tug of war.

• gravity

• balanced force

• friction

• jump

The force of 2 objects rubbing together is called_________________.

• balanced force

• velocity

• friction

• melt

How fast something is moving is called_________________.

• speed

• lazy

• force

• gravity

Tags

NGSS.MS-PS3-1

The amount of material that makes up an object is called _________________________.

• clothes

• motion

• mass

• pull

Grandpop gets a flat tire. He uses a jack to lift up his car. Why is a jack useful?

• It teaches you how to be safe when you drive a car.

• It makes your car push things with greater force.

• It helps a tow truck pull your car to the garage.

• It lets you use force to lift very heavy objects.

Why does it take more force to move a baseball than a paper airplane?

• Because the baseball is heavier than the paper airplane.

• Because the baseball is lighter than the paper airplane.

• Because the baseball is round and the plane is not.

• Because the baseball is smaller than the paper airplane.

Tags

NGSS.MS-PS2-2

According to Newton's first law, an object in motion will stay in motion unless:

• An opposite force acts against it.

• It's in outer space.

• It stops.

• It remains at rest.

What causes a ball rolling across a rug to slow to a stop?

• The rug doesn't have enough force to hold the ball.

• Friction resists the balls forward motion,

• The rug doesn't have the momentum to keep the ball rolling.

• The ball isn't moving fast enough.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which of these can cause a moving object to change direction?

• inertia

• velocity

• force

• mass

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

What is the force that pulls things toward the center of the Earth?

• the sun

• gravity

• air force

• matter

Tags

NGSS.MS-PS2-4