Friction Experiment

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Experiment 37: Friction
Anne Smolinski as910513@ohio.edu Wednesday 11:50-1:40
TA: Sanjoy Sarkar
November 11, 2017

Experiment 37: Technical Report

ABSTRACT In experiment 37, the friction force is being explained and tested by using a block that is being pulled across a wooden base. Out of the four different types of friction, two will be tested during this experiment: (i) static and (ii) kinetic. Static friction can be defined as the force that resists motion of an object to a surface so there motion is not relative to one another. The maximum static friction force (f_(s max)) is the maximum force applied to the block before it starts to move. After the maximum static friction has been reached the block starts to move and the friction is
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In this experiment, we pulled a weighted block across the table and measured the amount of force it took for the block to begin to move. Theory states that static friction is a force that resists motion. When two surfaces are moving across each other, there is friction force that slows down an object by taking away some of the energy. Static friction (f_smax=μ_s f_N) resists motion. An example of static friction is when you are pushing a heavy object. At the beginning, it is hard to push the desk - which is the static friction. Once the object begins to move, that is when kinetic friction comes into the problem. Kinetic friction is when two surfaces are moving relative to each other. Kinetic friction will always be smaller then static friction. The object that is being moved is exerting a positive velocity and the surface is having the same but negative velocity. The maximum amount of force that can be applied to an object before it starts to move is the maximum static friction force. Static friction becomes kinetic friction when it is overcome by to force applied as the two surfaces are sliding relative to each other. We were able to calculate the amount of force it took to get the block to start moving. For the purpose of this experiment, we presumed the earth and table are not moving, so the normal force and gravitational force are the only values we are using we are able to use the …show more content…
We calculated the coefficient of kinectic friction two differents way. The first method we used was based on calculating the kinetic friction from velocity of the moving block. The second method we used was using the acceleration of the block to figure out the kinetic friction force then the coefficient of kinetic friction. In real world situations, the value of kinetic friction will always be smaller then the value of static friction. In our experiment we figured out the value of the coefficient of static friction to be 0.52229 and the value of the coefficient of kinectic friction to be 0.45797 and 0.60758. We have two different values for the coefficent of kinectic friction because we calculated it using two different methods. The 0.45797 value was from the first method where we used the constant velocity in our calculations. The 0.60758 value was from the second method where we used the acceleration in our calculations. The value of static friction is 3.296. The value of kinetic friction using the first method is 2.89. The value of kinetic friction using the second method is 3.83. In our calculations, for the first case, the value of the coefficient of kinetic friction is smaller then the coefficient of static friction. In the second case, our calculated value of the coefficient of kinetic friction is larger then the

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