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In physics, a force is any influence that causes an object to undergo a certain change.In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or a flexible object to deform, or both.A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F. F=ma where m-mass,a-acceleration.

 A force is said to do work when it acts on a body, and there is a displacement of the point of application in the direction of the force.

work,W=Fd where d denotes displacement.

In physics, energy is one of the basic quantitative properties describing a physical system or object's state. Energy can be transformed to a number of forms. Energy, like mass, is a scalar physical quantity.The joule is the International System of Units (SI) unit of measurement for energy.