Describe an experiment to measure the coefficient of static friction. 

• A block of mass m is placed on a flat table and connected to a scale pan as shown in the diagram above.
• Small weights are added in bits on to the scale pan until the block just starts to move. The total weight of the scale pan and weights added is obtained, W_f.
• The coefficient of static friction is given by

Alternative method

• A block is placed on horizontal plane. The plane is tilted gently until the block just start to slide
• The angle of tilt θ is measured
• The coefficient of static friction, μ = tanθ

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