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friction lab

# friction lab - Ashley Morgan Rachel Aragone Christian...

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Ashley Morgan, Rachel Aragone, Christian Harding Report for Friction Lab October 4, 2007 Introduction: Though most people perceive friction as a bad concept, making us push or pull a little harder, it is actually a key component of our daily lives. Without friction, we would not be able to walk, apply brakes while driving, sit in a chair, or even use a mouse to surf the web. The intention of this lab was to develop an understanding of friction and the factors that determine its force. Friction is defined as the force that opposes the relative motion of two surfaces in contact. In this lab the two surfaces would this would be referring to are wooden blocks and a wooden board. The first part of our lab focused on how the amount of force pressing the blocks and board together affected the friction. The second part of our lab focused on the surface area of contact between the two surfaces and how it affected the friction. Part I. Dependence on Normal Force In order to find the dependence of normal force on, we needed to measure the frictional force. Therefore, we set up the wooden board with a pulley on the end so that we could add weights according to the mass of the blocks. A light string connected the blocks and weights ( refer to diagram 1) so that we could use Newton’s second law, the rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction, to measure the frictional force.

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friction lab - Ashley Morgan Rachel Aragone Christian...

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