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Work down by static friction on an objec...

Work down by static friction on an object `:`

A

may be positive

B

must be negative

C

must be zero

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A

Consider the blocks shown in the figure to be moving together due to friction between them. The free body diagrams of both the blocks is shown below.

Work done by static friction on `A` is positive and on `B` is negative.
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Work done by static friction on a body in an inertial frame: (A) must be +ve (B) must be -ve(c) must be zero (D) may be-ve

STATEEMNT-1 : Work done by frictional force is always either negative or zero. because STATEMENT-2 : Work done by the static friction on a system may be zero.

Knowledge Check

  • STATEMENT-1 Work done by static friction in any reference frame is zero STATEMENT-2 If work done on the body is positive its kinetic energy increases.

    A
    Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-9
    B
    Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-9
    C
    Statement-1 is True, Statement-2 is False
    D
    Statement-1 is False, Statement-2 is True

  • Work done by force of static friction .

    A
    can be positive
    B
    can be negative
    C
    can be zero
    D
    All of these

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