Forces and Motion : Friction (Quiz)

1. Friction is a force that opposes motion when two surfaces are _______.

• a) at distance

• b) in contact

• c) in view

2. ________ is produced as result of friction between two objects.

• a) Cooling effect

• b) Heat

• c) Nothing

3. Friction caused _________ and ________.

• a) wear and tear

• b) movement and action

• c) both of above

4. Air resistance can be reduced by using ______________

• a) streamline body

• b) straight body

• c) cubic body

5. ____________ are used to reduce friction.

• a) Plastic

• b) lubricants

• c) rough surface

6. The rougher the surface, the ______________ the friction.

• a) greater

• b) lesser

• c) normal

7. The friction between eraser and table causes _________ to ear off.

• a) table

• b) eraser

• c) none of above

8. Friction between backside of a cyclist and seat of cycle helps to ______________ a cycle smoothly.

• a) ride

• b) stop

• c) push

9. It is difficult to walk on a wet surface or icy lakes due to less _______________.

• a) friction

• b) lubrication

• c) surface area

10. Soap, liquid dish wash, oil and water all are examples of _____________

• a) streamline body

• b) water resistance

• c) lubricants