Q. 45.0( 3 Votes )
A force F is appl
1. Work done by the force on the block is Fd.
Displacement due to force = d
We know that
Work done= force × displacement × cos θ
θ in our case is zero as displacement is in the direction of the force.
Work done by the force = F ×d ×cos 0
=F ×d (∵ cos0=1)
∴ Work done by the force on the block is F ×d.
2. Internal energy will not change because of work done by the force on the block.
Internal energy is defined as the sum of the kinetic energy and potential energy of molecules of the system. It includes only the energy associated with the random motion of molecules of the system.
If the block moves as a whole system with some velocity, the kinetic energy of the box is not to be included in internal energy.
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