Past paper of Physics Olympiad --- Newton's Laws of Motion1.(03.1)Ball A was dropped from the top of a tall building. At the same instant and from the same height ball B was thrown straight downward. Neglecting the effects of air friction, compare their accelerations while they were falling.A. Their accelerations are equal.B. Ball A has the greater acceleration.C. Ball B has the greater acceleration.D. It is impossible to tell since their accelerations vary greatly.E. None of the above.2.(03.2)Two objects, A and B, accelerated from rest at the same uniform rate. Object B accelerated for a distance twice as long distance A. Compare to Object A, Object B was movingA. Twice as fast.B. 1.414 times as fastC. Three times as fast.D. Four times as fast.E. None of the above.3.(03.4)Which of the following statements is correct?A. When you are not moving there is no force exerting on you.B. When there is no force exerting on you, you cannot move.C. When you are not moving there is no net force exerting on you.D. There must always be force acting on you when you move.E. None of the above.4.(03.5)A desk and a book are resting on the ground. Which of the following changes when the book is put on the desk?A. The net force acting on the desk.B. The gravitational force acting on the desk.C. The reaction force from the ground acting on the desk.D. The kinetic energy of the book.E. The kinetic energy of the desk.
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