MEDIUM
8th CBSE
IMPORTANT
Earn 100

Why do we use ball bearings to reduce friction?

Important Questions on Friction

HARD
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G
With the help of an activity, explain the effect of friction on the nature of surface in contact.
 
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G
How does applying talc on the carom board help?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G
What are lubricants? How do they work?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G
Three children are at work. One is pushing a chair, another is pushing the sofa and the third one is pushing an empty trolley. Who is experiencing the maximum friction?
MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G

Give reason: Large-size suitcases are fitted with wheels.

MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G

Give reason: The worn-out tyres should be discarded.

MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G

Give reason: If you try to hold a glass with soapy hands, it can slip.

MEDIUM
8th CBSE
IMPORTANT
Expanded Universal Science>Chapter 12 - Friction>ASSESSMENT ZONE>Q G
Suppose the entire surface of Earth was covered with a sheet of hard ice that offers zero friction. If you push a ball on this surface, how far would it go?