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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) \(K = \tfrac{1}{2}mv^2\).
(iv) \(U = mgh\).
(v) rate at which work is done.
