Frictional Forces

Frictional force acts in the .................. direction of motion

• same

• upward

• opposite

• downward

The rougher the surface, the greater the frictional force of the object.

• True

• False

Which of this picture has useful frictional force?

• 
• 
• 
• 

Which friction can be a problem to us?

• 
• 
• 
• 

What are 2 better ways to reduce the frictional force?

• applying oil on the machine

• not using the ball bearings

• reduce the wheels on the suitcase

• polishing the surface of the slide

Tags

NGSS.MS-ETS1-2

a force is a . . . . or a . . . .

Tags

NGSS.MS-PS2-1

Which of the following are the correct ways to reduce frictional friction?

• the usage of brake on the bike

• apply a lubricant (oil) on the moving part of a machine

• the soles of shoes prevent us from slipping

• use rollers / wheels to move heavy objects

The book will move further along a smooth surface than a rough surface.

• true

• false

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

if there were no frictional force, the moving coin would come to a stop on the table.

• true

• false

Tags

NGSS.MS-PS2-2

A Frictional force can . . . . or . . . . a moving object.

• speed up

• stop

• move

• slow down

Tags

NGSS.MS-PS3-5