A1 Force of friction(TG)

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A1  Force of friction

Procedure

2.        Increase slowly the pulling force from zero until the block starts to move. Take 5 readings of the spring balance during the process.

3.        Pull the moving block at a constant speed as shown. Take 5 readings of the spring balance.

4.        Plot a graph of frictional force (static and kinetic) against the applied force.

Note : Assume the kinetic friction is a constant when the applied forces increases.


5.        Connect the spring balance to a wooden block. Pull slowly the spring balance until the block starts to move. Record the value of the applied force (F = fL) that just sets the block in motion. Fill in the table below.

Take g = 10.0 m s−2  and mass (1 wooden block) = 0.53 kg.

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8.        Plot the graph of the limiting static friction (fL) against the normal force (R).

        Since fL =μs R, find the value of coefficient of static friction (μs) from the graph.

The slope of the straight line () = 0.42


9.        Plot the graph of the kinetic friction (fk) against the normal force (R). Since fk = μk R, find the value of coefficient of kinetic friction (μk) from the graph.

The slope of the straight line () = 0.26

  1. Repeat steps 5 to 9 by replacing the wooden block with the bricks. Find the values ofμs andμk for the ...

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