Friction force(SSN)

Complete the sentence. Friction always ____________

• helps the motion

• opposes the motion

• both of these

• none of these

Rolling friction is smaller than?

• Sliding friction

• Static friction

• Fluid friction

• All of the above

Which of the following produces least friction?

• Sliding friction

• Rolling friction

• Composite friction

• Static friction

Static friction is less than

• sliding friction

• rolling friction

• both (a) and (b)

• none of these

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

• Stone

• Plastic block

• Wooden block

• Glass block

Which of the following is not a smooth surface?

• Surface of wet soap

• Surface of tyres

• Glazed tiles

• Surface of mirror

A toy car released with the same initial speed will travel farthest on

• muddy surface

• polished marble surface

• cemented surface

• brick surface

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Smooth surface has

• less friction

• more friction

• sometimes less and sometimes more

• all of these

Which of the following is responsible for wearing out of bicycle tyres?

• Muscular force

• Magnetic force

• Frictional force

• Electrostatic force

It is difficult to walk on an oily floor because

• Floor gets spoiled

• There is more resistance

• Force of friction is high

• Force of friction is very less