9.
What will happen if the external unbalanced force on a
moving car is removed? (neglect friction)
(A) It will start moving faster than earlier
(B) It will come to rest
(C) It will move with the uniform velocity it has acquired till then
(D) It will start moving slowly
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VIDEO
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Force
In the previous chapter, we described 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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