Statement 1: If the work done by force other than conservative forces is zero, then mechanical energy is conserved. Statement 2: The work done by non-conservative forces is always negative.

Question

Statement 1: If the work done by force other than conservative forces is zero, then mechanical energy is conserved. Statement 2: The work done by non-conservative forces is always negative. (A) Statement-1 is true, Statement-2 is false (B) Statement-1 is false, Statement-2 is true (C) Statement-1 is true, Statement-2 is true and Statement-2 is a correct explanation for Statement-1 (D) Statement-1 is true, Statement-2 is true but Statement-2 is not a correct explanation for Statement-1-

Tardigrade Admin · Accepted Answer

Statement-1 is true, Statement-2 is false.

W_{other} = Δ K + Δ U

If

W_{other} = 0,

then

Δ K + Δ U = 0

. If a block is sitting over another block. Suppose the lower block is moved and the upper block moves along. Then work is done by static friction on the upper block and it is +ve.

Q. Statement 1: If the work done by force other than conservative forces is zero, then mechanical energy is conserved. Statement 2: The work done by non-conservative forces is always negative.

Statement-1 is true, Statement-2 is false

Statement-1 is false, Statement-2 is true

Statement-1 is true, Statement-2 is true and Statement-2 is a correct explanation for Statement-1

Statement-1 is true, Statement-2 is true but Statement-2 is not a correct explanation for Statement-1-

Statement-1 is true, Statement-2 is false. Wother ​=ΔK+ΔU If Wother ​=0, then ΔK+ΔU=0. If a block is sitting over another block. Suppose the lower block is moved and the upper block moves along. Then work is done by static friction on the upper block and it is +ve.

Q. Statement 1: If the work done by force other than conservative forces is zero, then mechanical energy is conserved.
Statement 2: The work done by non-conservative forces is always negative.

Statement-1 is true, Statement-2 is false.
$W_{other} = Δ K + Δ U$
If $W_{other} = 0,$ then $Δ K + Δ U = 0$ . If a block is sitting over another block. Suppose the lower block is moved and the upper block moves along. Then work is done by static friction on the upper block and it is +ve.