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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. = ______


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 W


Physics
Concise Physics
Standard VIII

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