Friction force

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

• light energy

• electricity

• friction force

• A and B

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

• Movement force

• Heating energy

• Friction force

• Kinetic energy

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

Sliding a body down over another body means that ......

• the friction force between the two bodies is larger than the movement force

• the friction force between the two bodies is smaller than the movement force

• the movement force between the two bodies is smaller than the friction force

• no correct answer

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).

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

• increases

• decreases

• doesn't change

• (a), (b), and (c)

When the speed of the moving object increases, the friction force .....

• increases

• decreases

• doesn't change

• (a), (b), and (c)

The stopping of the bike gradually during movement is due to the increase in ......

• the friction force

• the magnet

• the attraction force

• all the previous answers

Tags

NGSS.MS-PS3-5

The moving bike is affected by air resistance that acts ....... to its movement.

• in the perpendicular direction

• in the opposite direction

• in the same direction

• parallel