PHYL-111-LAB-IE- Friction-F06

# PHYL-111-LAB-IE- Friction-F06 - COLLEGE PHYSICS I PHYL-111...

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COLLEGE PHYSICS I PHYL-111 EXPERIMENT-I-F : STATIC AND KINETIC FRICTION If you try to slide a heavy box resting on the floor, you may find it difficult to get the box moving. Static friction is the force that is counters your force on the box. If you apply a light horizontal push that does not move the box, the static friction force is also small and directly opposite to your push. If you push harder, the friction force increases to match the magnitude of your push. There is a limit to the magnitude of static friction, so eventually you may be able to apply a force larger than the maximum static force, and the box will move. The maximum static friction force is sometimes referred to as starting friction. We model static friction, F static , with the inequality F static μ s N where s is the coefficient of static friction and N the normal force exerted by a surface on the object. The normal force is defined as the perpendicular component of the force exerted by the surface. In this case, the normal force is equal to the weight of the object. Once the box starts to slide, you must continue to exert a force to keep the object moving, or friction will slow it to a stop. The friction acting on the box while it is moving is called kinetic friction. We model kinetic friction with F kinetic = k N , where k is the coefficient of kinetic friction. In this experiment, you will use a Force Sensor to study static friction and kinetic friction on a two different materials (wooden block & glass). A Motion Detector will also be used to analyze the kinetic friction acting on a sliding block. Objectives Use a Dual-Range Force Sensor to measure the force of static friction. Determine the relationship between force of static friction and the weight of an object. Measure the coefficients of static and kinetic friction for a particular block and track. Determine if the coefficient of kinetic friction depends on weight. Materials computer string Vernier computer interface Logger Pro balance or scale Vernier Force Sensor mass set Physics with Computers 1

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Experiment 12 Procedure Part I: 1.
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## This note was uploaded on 06/30/2008 for the course PHYSICS 111 taught by Professor B during the Spring '08 term at Iowa State.

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PHYL-111-LAB-IE- Friction-F06 - COLLEGE PHYSICS I PHYL-111...

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