Recitation Worksheet F Solutions

# Recitation Worksheet F Solutions - Worksheet F Newton's...

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Worksheet F: Newton’s laws. 1-I. Three identical blocks are pushed across a table at constant speed as shown below. The hand pushes horizontally. There is friction between the table and the bricks. We shall call the stack of two bricks system A and the single brick, system B. a. Compare the net force (magnitude and direction) on systems A and B. The net force is zero in both cases because the speed is constant (ie, a = 0) b. Draw the free body diagram for each system in the spaces below. Clearly label all forces (eg: a normal force on A by the hand should be labeled N A,hand or something of the sort). (vector lengths not to scale) c. Consider the following discussion between two students: Student 1: I think the free-body diagram for system B should have a force by A and a force by the hand. Student 2: I don’t think the diagram should include a force by the hand. People cannot exert forces on objects without touching them. With which student, if either, do you agree? Explain your reasoning. If you disagree with a statement, explain what is wrong with it. Student 2 is right: the ultimate reason why A is pushing on B is the hand, but that does not mean that the force by the hand acts on B. The force on B is exerted by A (N B,A ) and is different the force exerted on A by the hand (N A, hand ).

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