A book falls off a desk. What moves the book towards the floor?

• mass

• gravity

• friction

• speed

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which best explains why a bicycle slows down when it brakes are applied?

• The brakes heat the rubber on the bicycle tires

• the brakes add energy to the bicycle

• the brakes cause frictional forces on the wheels of the bicycle

• the brakes increase the force of gravity on the bicycle

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

A soccer ball is kicked and rolls along a flat field of grass until it comes to a stop. What is MOST responsible for the ball coming to a stop?

• air

• gravity

• mass

• friction

Tags

NGSS.MS-PS2-2

A child rides a sled down the snowy hill. Which force is MOST responsible for causing the sled to slow down and stop?

• gravity

• friction

• magnetism

• motion

Tags

NGSS.MS-PS2-2

Movers slide a box down a ramp of a truck. What helps slow down the box as it slides to the bottom of the ramp?

• friction

• inertia

• gravity

• magnetism

A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon?

• It would cause the wagon to move faster.

• It would cause the wagon to change mass.

• It would cause the wagon to change direction.

• It would cause the wagon to slow down

Tags

NGSS.MS-PS2-2

Which of the following is an example of friction that is helpful?

• car tires on the road

• bike brakes

• tread on the bottom of your shoes

• all examples are helpful

When an object moves from one place to another, we call it...

• friction

• motion

• gravity

• force

a cup sitting on the table has what type of force?

• unbalanced force

• gravity only

• friction

• balanced force

A water bottle tipping over on your desk has what type of force?

• balanced force

• unbalanced force

• friction

• magnetism