ObjectiveTo take the measure of the force of friction.
MaterialsString, a brick or a rectangular piece of wood, and a spring balance.
MethodTie a brick or rectangular piece of wood at one end of a string and a spring balance at the other end. Now place it as in position 1 in the figure and drag it, and note how much force was needed. Then repeat it placed as in position 2 and note the force. Now place one object on top of another as in position 3, pull as before, and note the force.
Discussion and conclusionAnalyse the result of this experiment and draw a conclusion from it.
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