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...Work is said to be done when a force acts on an object and the displaced in direction of product applied displacement x w f s unit joule j if newton metre then nm or so amount i displaces by eg n through m may positive negative are same opposite directions zero there no perpendicular we lift moves upward here but gravity acting downward porter lifts luggage kg from ground puts it his head above calculate him mass acceleration due ms mg energy its capacity for doing as that required do kilo kj different forms they heat light electrical chemical mechanical potential kinetic etc possessed motion all moving objects possess falling coconut speeding car flying aircraft flowing water blowing wind running athlete depends upon speed faster has more than slower with uniform velocity v k e mv what position shape rubber band stretched released regains original transferred stored key toy place spring inside height release falls down lifted...