Friction class 8

friction is a _________ force

• Non contact

• Contact

• magnetic

• electrostatic

Friction always

• Helps in motion

• Opposes motion

• Both of these

• None of these

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed
• less friction doesn't affect speed

What type of friction is it when the object doesnot move even when external force is applied on it?

• static

• sliding

• fluid

• rolling

A force of friction which balances the applied force during the stationary state of a body is called _________

• force

• Sliding friction

• Static friction

• Rolling friction

Sliding friction is _________ than the static friction

• less

• more

• equal

• zero

Rolling friction is _______ than sliding and static friction

• Lesser

• Equal to

• Greater

• None of the above

What kind of substances are known as lubricants?

• Increase friction

• Decrease friction

• Increase or decrease friction

• None of these

Friction produced due to fluids is called

• Sliding Fiction

• Rolling friction

• Static friction

• Drag

Which is a/ are streamlined object?

• Aeroplane

• Boat

• Ship

• All the above