Question

# (a) Work is said to be done by a force only when _________ (b) Work done = Force × _________ (c) The energy of a body is its capacity to do ______ (d) The S.I. unit of energy is ______ (e) The potential energy of a body is due to its ______ and kinetic energy of body is due to its ______ (f) Gravitational potential energy U = mass × force of gravity on unit mass × _________ (g) Kinetic energy = 12× mass ×_________ (h) Power P = ______ / time taken. (i) The S. I. unit of power is ______ (j) 1 H.P. = ______ W

Solution

## (a) Work is said to be done by a forte only when the body moves. (b) Work done = Force × distance moved in direction of the force. (c) The energy of a body is its capacity to do work. (d) The S.I. unit of energy is joule. (e) The potential energy of a body is due to its state of rest or position and kinetic energy of the body is due to its state of motion. (f) Gravitational potential energy U = mass × force of gravity on unit mass × height. (g) Kinetic energy = 12× mass × speed2 (h) Power P = worktimetaken. (i) The SI  unit of power is watt. (j) 1 H.P. = 746 WPhysicsConcise PhysicsStandard VIII

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