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A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to m.
The hand pushes the block from A to C using a constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is ½ meter and the distance from B to C is also ½ meter.

- Describe in words the motion of the block as it moves from A to C.
- Draw a free-body diagram for the block when it is at point P.
- What is the direction of the acceleration of the block at point P? If it is 0, state that explicitly. Explain your reasoning.
- Does the magnitude of the acceleration increase, decrease, or remain the same as the block moves from B to C? Explain your reasoning.
- What is the net work done on the object as it moves from A to B? From B to C?
- Calculate the coefficient of friction m.

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Page last modified October 15, 2002: P&E17