Physics111L_Friction_291291

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University of Southern Mississippi *

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111L

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Physics

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Dec 6, 2023

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docx

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A force that acts parallel to the surface 1 Friction A force that acts perpendicular to the surface 2 Normal A force that increases as applied force increases up to some maximum value 3 Static friction Magnitude depends on the interacting materials 4 Coeﬃcient of friction A force that is constant regardless of the applied force 5 Kinetic friction Physics 111L Friction Final Report Student Name Kyra Pell Student ID 291291 Lesson Friction Institution University of Southern Mississippi Session Fall 2023 Course Physics 111L Instructor Sidney Gautrau Test Your Knowledge Match each term to the best description.

1 N 2 f 4 mg sinθ 3 mg cosθ 1 2 4 3 Static friction μ k Kinetic friction μ s Label the force arrows on the free-body diagram. Label the force versus time graph.

Categorize each statement as True or False. True False 1 2 Static friction is caused by molecular Kinetic friction is caused by molecular bonds. bonds. Friction between objects increases Friction does not always increase the thermal energy of both objects. temperature of interacting objects. Increasing in the normal force between Increasing the surface area of two objects increases the friction force interaction between two objects between them. increases the friction force between them. Exploration The force of friction always acts parallel to the surface of interaction. True False When the objects are moving relative to one another, the speed of the moving object affects the magnitude of what is known as the kinetic friction force. True False The force of static friction is always equal to the coeﬃcient of static friction multiplied by the normal force. True False

The force of kinetic friction for a particular pair of interacting objects is always the force of static friction. less than greater than equal to None of the above Static friction is caused by molecular and kinetic friction is caused by molecular . attraction; bonds attraction; repulsion bonds; attraction None of the above The coeﬃcient of static friction is related to the maximum angle of repose by . μ s = sin θ max μ s = tan θ max μ s = θ max None of the above The coeﬃcient of kinetic friction is found from the equation: . μ k = F app FN F N μ k = F app μ k = F app × F N None of the above

rce up to some maximum value. With this said, once an object starts to slide along the surface of another object, the friction force between the objects b e nature of the interaction), the normal force (which is related to the weight of the object and the angle of the surface) and the properties of the surfaces orce needed to move the block in either position is the same as well. Since we know that surface area has no direct effect on the forces of friction, this le e greater the static force needed to indicate movement. This in turn, effects the static friction coefficient, meaning that the less surface area between the The force of friction is always represented as a horizontal arrow in a free- body diagram. True False Exercise 1 Explain the difference between static friction and kinetic friction. Discuss the relationship between friction, normal force, and surface area. Compare the static and kinetic friction forces and coeﬃcients determined for the ﬂat wooden friction block and the wooden friction block on its side that were recorded in Data Table 1. What was the relationship of surface area to the force and coeﬃcient of friction between the objects?

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