tutorial3_sp10

1 e what type of force eg frictional gravitational etc

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Unformatted text preview: her. 1 e) What type of force (e.g. frictional, gravitational, etc.) does the brick exert on the cart? (Hint: it's not gravitational. Why not?) f) Does any force on the cart have the same magnitude as a force on the brick? Which? g) Using the result for f), write an expression for the normal force the table exerts on the cart in terms of m, M and g. h) Now think of the cart and brick together as a single object, whose mass is now m+M. How does the normal force exerted by the table on this single object compare to your answer for part g)? i) Now, suppose the table collapsed when the brick was placed on the cart. How could you explain that in terms of the forces on your free-body diagram? 2. Drawing free-body diagrams for objects in motion. The following questions refer to a system of three identical bricks, stacked as shown in Fig. 1, being pushed across a table horizontally at a constant speed. Each brick has mass m. Call the stack of two bricks System A, and the single brick on the right System B. There is a frictional force with coefficient µ. a) Compare the net force on System A to the net force on System B. How did you come to this conclusion? Fig. 1. Three bricks stacked, being pushed by the hand at constant speed. b) Draw separate free-body diagrams for System A and System B. L...
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