Task 2: Mass and the Force of Friction The data in the Table I were gathered using a force meter pulling horizontally on a block of wood placed on a level flat surface also made of wood. To increase the weight being pulled by the force meter, extra masses were added to the top of the block before each of the four trials. The diagram below shows the experimental set-up for the first part of this experiment, where the forward direction is to the right. The parameter being controlled in this experiment is the nature of the wooden surfaces. The variable being manipulated is the mass of the wood. The variables being measured are the forces of friction. The parameters being tested are the coefficients of friction. Block of wood Two extra masses Force sensor Force of friction drags String Applied force Wood surface TVO ILC SPH4C Learning Acitivity 1.5 Calculating Coefficients of Friction The maximum static friction is defined as the largest recorded reading on the force sensor before the block starts moving; the kinetic friction is defined as the force, as measured on the force sensor, that causes the block to move at a constant velocity. Table I: Mass and Friction Data Total mass (kg) (wood block plus Maximum Fs FK FN = mg masses on (N) (N) (N) us top) 0.50 1.96 1.47 1.0 3.92 2.94 1.5 5.88 4.41 2.0 7.84 5.88 Treatment: Complete the table. Analysis: 1. Plot a graph of force of static friction vs normal force. Calculate the slope of this graph. 2. Plot a graph of force of kinetic friction vs normal force. Calculate the slope of this graph