ICSE-VIII-Physics
04: Energy Class 8 Physics
- #2Fill in the blanks (a) Work is said to be done by a forte 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 = 1/2 × mass × ____ (h) Power P = _____/time taken. (i) The S.I. unit of power is ____ (j) I H.P. = ____Ans : (a) Work is said to be done by a forte only when the body moves. (b) Work done = Force × distance moved in direction of 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 body is due to its state of motion. (f) Gravitational potential energy U = mass × force of gravity on unit mass × height. (g) Kinetic energy = 1/2 × mass × (speed)2 (h) Power P = work done/time taken. (i) The S.I. unit of power is watt (j) I H.P. = 746 W
- #2-aWork is said to be done by a forte only when ____Ans : Work is said to be done by a forte only when the body moves.
- #2-bWork done = Force × ____Ans : Work done = Force × distance moved in direction of force.
- #2-cThe energy of a body is its capacity to do ____Ans : The energy of a body is its capacity to do work.
- #2-dThe S.I. unit of energy is ____Ans : The S.I. unit of energy is joule.
- #2-eThe potential energy of a body is due to its _____ and kinetic energy of body is due to its _____Ans : The potential energy of a body is due to its state of rest or position and kinetic energy of body is due to its state of motion.
- #2-fGravitational potential energy U = mass × force of gravity on unit mass × ____Ans : Gravitational potential energy U = mass × force of gravity on unit mass × height.
- #2-gKinetic energy = 1/2 × mass × ____Ans : Kinetic energy = 1/2 × mass × (speed)2
- #2-hPower P = _____/time taken.Ans : Power P = work done/time taken.
- #2-iThe S.I. unit of power is ____Ans : The S.I. unit of power is watt
- #2-jI H.P. = ____Ans : I H.P. = 746 W