Friction Force

When we rub our hands together _________.

• frictional force works between them

• energy is released

• our hands become warm

• all off the above

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The effect of the friction force is to.................the speed of an object.

• speed up

• slowdown

Tags

NGSS.MS-PS3-5

Which object would have more friction force?

• light object

• heavy object

• long object

Without friction, an object in motion would never stop.

• true

• false

......... slow down the moving object.

• Movement force

• Heating energy

• Friction force

• Kinetic energy

Tags

NGSS.MS-PS2-2

Friction force depends on ...

• The type of the material surface only.

• the surface area of the moving objects

• the speed of the moving object.

• (a), (b), and (c).

During skating on ice, a (an) ......... arises.

• light energy

• electricity

• friction force

• A and B

Tags

NGSS.MS-PS2-2

Friction force acts in a direction ........ the direction of motion.

• opposit to

• prependicular to

• parallel to

• the same to

There is friction force between ........

• the bicycle's tire and the road

• the ball and the ground

• two books touches each other

• all of the above

Tags

NGSS.MS-PS2-2

When the surface area of the moving object increases, the friction force ......

• increases

• decreases

• doesn't change

• (a), (b), and (c)