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Fill in the blanks.
(i) Work done = ______ × ______ (in the direction of force).
(ii) 1 joule of work is done when a force of ______ newton displaces an object by 1 metre in the direction of the force.
(iii) The expression for kinetic energy of a body of mass m and velocity v is ______.
(iv) The potential energy of an object of mass m at a small height h from the Earth's surface is ______.
(v) Power is defined as the ______ at which work is done.
Show Answer
(i) force × displacement .
(ii) 1 newton.
(iii) K = 1 2 mv 2 .
(iv) U = mgh .
(v) rate at which work is done.
| Blank | Answer |
|---|---|
| (i) Work done = ____ × ____ | force × displacement (in the direction of the force) |
| (ii) 1 joule when a force of ____ newton | 1 newton |
| (iii) kinetic energy of mass m, velocity v | 1 2 mv 2 |
| (iv) potential energy at a small height h | mgh |
| (v) power is the ____ at which work is done | rate |
