assertion when we stop pedaling the bicycle it becomes to rest due to the frictional force acting opposite to the direction of motion
reason if the resultant is zero the forces are called unbalanced forces
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the motion of an object along a straight line in terms of its position, velocity and acceleration. We saw that such a motion can be uniform or non-uniform. We have not yet discovered what causes the motion. Why does the speed of an object change with time? Do all motions require a cause? If so, what is the nature of this cause? In this chapter we shall make an attempt to quench all such curiosities.
For many centuries, the problem of motion and its causes had puzzled scientists and philosophers. A ball on the ground, when given a small hit, does not move forever. Such observations suggest that rest is the 'natural state' of an object. This remained the belief until Galileo Galilei and Isaac Newton developed an entirely different approach to understand motion.
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