# Lab Report of PHYS 111A(lab 106(2)) - Lab Report of PHYS...

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Lab Report of PHYS 111A Lab Number and title: Lab 106(2): Static and Kinetic Frictions Introduction The objective is to find the static and kinetic friction through sensors and equations
Another objective is to use a free body diagram to determine where all the forces are when pulling an object up an inclined plane There is always a frictional force when an object slides through a surface There is a gravitational force exerted on an object, and it is counteracted by a normal force A force can be applied(Force applied) to push the object to make it slide through a surface The applied force has to be larger than the maximum static frictional force in order for it to keep sliding Kinetic frictional force is the force acting on the object when it is sliding For an inclined plane: o y= N-mgcos(theta)=0 N=mgcos(theta) o x=force applied-mgsin(theta)-kinetic friction(or static friction)=0 o µ static =tan(theta) o mgsin(theta)=µmgcos(theta) For static friction force: o F static static *Normal force For kinetic friction force: o F kinetic =u kinetic *Normal force Procedure Pt.1 o Use the Lab 106 Friction file on the desktop o
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