Force and Motion CHAPTER4 45 4.6 Newton\'s First Law 18. If an object is at rest

Question

Force and Motion CHAPTER4 45 4.6 Newton's First Law 18. If an object is at rest, can you conclude that there are no forces acting on it? Explain. 19. If a force is exerted on an object, is it possible for that object to be moving with constant velocity? Explain. 20. A hollow tube forms three-quarters of a circle. It is lying flat on a table. A ball is shot through the tube at high speed. As the ball emerges from the other end, does it follow path A, path B, or path C? Explain your reasoning. View from above

Explanation / Answer

18. for an object at rest, from newtons first law of motino, there is no net force acting on the object in that specific frame of reference, where the object is seen at rest. hence , for a frame of reference where the object is not seen at rest , the net force acting on the partcile can be non zero,

19. for an object moving with some velocity, the rate of change of velocity gives us accelertion of the object whiich is a result of application of net force on the object. hence twhen there is net force on the object, there is acceleration, and hence this means velocity has to change, not just its magnitude, sometimes its magnitude can stay constant and direction can change to change overall velocity.

20. when the ball emerges out of the slot, the net force acting on the ball is the force of gravity, which is downwards, and the ball has net initial speed upwards, hence the ballss will keep on moving in the same direciton
hence
the ball will follow path C

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