Friction Lab - Physics 20 Friction Lab Alice Hu Introduction Purpose To determine the relationship between the normal force and the applied force

# Friction Lab - Physics 20 Friction Lab Alice Hu...

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Physics 20: Friction Lab Alice Hu Introduction: Purpose - To determine the relationship between the normal force and the applied force required to maintain a constant speed of a wooden block sliding across a horizontal surface. Define “normal force” and “force due to friction” and “coefficient of friction”. Normal Force: The force that is perpendicular to the surface that the object has contact with. It is the force that the surface exerts to support the force that the object is exerting on it. Force due to Friction: The force that opposes or resists the motion of two surfaces sliding on top of each other. The Coefficient of Friction: A coefficient of friction is a value that demonstrates the relationship between force due to friction between two objects and the normal force between the two objects. Variables: Manipulated: The normal force ( F N ) Responding: The force of friction ( μ F N or F F ) Controlled: a) The type of spring scale used to measure the applied force. b) The side of the friction block used which would affect the coefficient of friction. Hypothesis: If the friction force increases, then the applied force required to maintain a constant speed of the wooden block will increase because the applied force must be equal to the friction force in order to maintain balanced forces which would mean that the Fnet = 0 which would give us a constant velocity due to Newton’s First Law. Because Fnet = Fa - Ff, the applied force and the friction force should have a direct relationship.

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• Fall '12
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