5. Suppose that a force F of 3.0 N is applied to the block. Sketch on the axes b

Question

5. Suppose that a force F of 3.0 N is applied to the block. Sketch on the axes be- low the shapes of the acceleration-time and velocity-time graphs for the block. Time 6. In each situation described below, compare the magnitudes of the two forces. Explain your answer in each case. a. A 90-kg man and a 60-kg boy each have one hand extended out in front and are pushing on each other. Neither is moving. Compare the force ex- erted by the man's hand on the boy's hand to that exerted by the boys hand on the man's. b. In (a), the boy begins to slide along the floor Now compare the same two forces between their hands. 17 LAB 7: PASSIVE FORCES AND NEWTON'S LAws

Explanation / Answer

For answering 5. mass of the block and figure of the block is needed.

6.(a) As the system of the man and boy is not moving, that is, they are in equillibrium or net force acting on them = 0.

Hence, force by man on the boy = force by boy on the man

(b) In this case as the boy is sliding along the floor, so, net force on them is acting along the sliding boy or along the direction where the man is applying force, which implies

Force by man on the boy > Force by boy on the man.

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