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Introduction to Forces

In a roller-coaster, when we pass through a turning, we get thrilled. Change in velocity is a thrill to experience and the cause for the motion of the roller-coaster, the change in its velocity is interesting physics to learn.

In the previous chapter we have studied the motion of bodies without reference to the cause for motion. Why do some bodies move, while some remain at rest? How can a body be accelerated? Galileo Galilei (1564–1642) conducted several simple experiments to answer these questions. He made an analysis of motion and concluded that the velocity of an object can be changed only by an external cause.

Sir Isaac Newton worked on Galileo’s ideas and named this cause for acceleration or change in velocity of an object as force.

He made careful observations on motion of bodies and expressed the basic principles of motion of bodies in three laws, called Newton’s laws of motion.

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