3 An apple is sitting on the outstretched palm of your hand. Explain your answer
ID: 1777759 • Letter: 3
Question
3 An apple is sitting on the outstretched palm of your hand. Explain your answers to the following a Only two forces act on the apple, the force of gravity and the normal force from your hand These two forces are equal in magnitude, opposite in direction. Explain why they are not action reaction pairs b As you move the apple upwards at constant speed are the two forces still equal in magnitude? c If you move your hand downwards at an increasing speed, are the two forces still equal in magnitude?Explanation / Answer
a) action and reaction pair act on two differenct bodies, but in this case gravitational force and normal force acting on the same body that is apple so, these forces are not action reaction pair
b) at constant speed acceleration is 0 so, net force will be 0 as force = ma, since no external force is acting two forces will remain to be in equal magnitude
c) if hand is moving downward with increasing speed normal force will be less than gravitational force
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