Question

You have wooden blocks and either an aluminum plane, or track, to make an incline. You also have a friction block with felt and wood sides, masses to tape to the block, a meterstick, stopwatch and video analysis equipment. WARM UP To figure out your prediction you must determine how to calculate the normal force and the kinetic frictional force from quantities you can measure in this problem. It is useful to have an organized problem-solving strategy such as the one outlined in the following questions. 1. What do you expect for the shape of a graph of kinetic friction force vs. normal force? What do you expect for the slope? 2. Make a drawing of the problem situation similar to the one in the Equipment section. Draw vectors to represent all quantities that describe the motion of the block and the forces on it. What measurements can you make with a meter stick to determine the angle of incline? Choose a coordinate system. What is the reason for using the coordinate system you picked? 3. What measurements can you make to enable you to calculate the kinetic frictional force on the block? What measurements can you make to enable you to calculate the normal force on the block? Do you expect the kinetic frictional force the track exerts on the wooden block to increase, decrease, or stay the same as the normal force on the wooden block increases? Explain your reasoning.

Answer 1

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