Question

When there is an interaction between different bodies, forces come into plays which are

classified as contact and non- contact force. These forces include muscular force,

gravitational force, frictional force etc. The force of friction is always directed along the

surface in contact i.e. it acts along the tangential direction .Friction is considered as a

‘Necessary Evil’ and depends upon the nature of two surfaces in contact.

a. Classify muscular force as Contact force/Non -contact force. 1

b. Name the type of non-contact force that is responsible for attraction and repulsion between

the charges. 1

c. Give any practical situation to show that friction is necessary 1

d, Arrange the following frictional forces in decreasing order:

Sliding friction, Rolling friction, Static friction 1

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Answer 1

Explanation:

Basketball players — including NBA superstars such as Stephen Curry, LeBron James, Michael Jordan, Kareem Abdul-Jabbar, Kobe Bryant, Shaquille O'Neal, Larry Bird, Wilt Chamberlain and Magic Johnson — excel at one of the most demanding and fast-paced of professional sports.