obtained by the pulling force divided by the weight of the barbell. The coefficient of kinetic friction can be obtained by using a different pulling force which it can be measured during the barbell is moving at a constant velocity in a straight motion. This pulling force is smaller than the last pulling force which it’s dealing with the static friction coefficient. If the object is not moving, the net force and the net torque on the object are both equal to 0. Torque is a rotational movement of an object which is equivalent of the force. The torque usually has a pivot point which can be chosen by anywhere along with the object in order to calculate the net torque of one object. For this leaning ladder experiment, we assumed that the pivot point would be the bottom part of the ladder which it’s in touching with the ground surface. We also assumed that the friction between the wall and top of the ladder which has a wheel attached to it is frictionless. One more assumption is that the protractor and small hanging mass and string under the protractor are not add additional mass on the ladder itself.
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