Questions and Answers
What does a free-body diagram show?
The known and unknown forces acting on an object
In a free-body diagram, what are pulleys assumed to be?
Frictionless and weightless
What is the nature of the frictional force in a free-body diagram?
It is opposite the direction of motion
What does the normal force represent in a free-body diagram?
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What two factors affect friction according to the text?
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What does the surface always exert on an object in terms of force?
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What is the formula used to calculate friction?
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Which type of friction keeps the object from moving or staying stationary?
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What is the coefficient of kinetic friction symbolized by?
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How is the direction of the coefficient of kinetic friction (µk) in relation to the motion of the object?
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What is the formula for calculating force of kinetic friction (Fk)?
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What does static friction depend on?
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What is the maximum value of static friction in the given sample problem?
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In the sample problem, if a bed is being pulled horizontally by an 875 N force and µk = 0.605, what is the normal force between the bed and the floor?
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When a grocery pushcart is being pushed with a normal force of 825 N, North, what is the friction between the pushcart and the floor if the coefficient of static friction (µs) is 1.0?
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Frictional force is always acting along the direction of motion.
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Frictional force is directly proportional to the normal force.
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Sliding friction depends on the speed of motion.
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The nature of material and existing questions affect friction.
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The surface always exerts a downward force on the object.
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The coefficient of kinetic friction (µk) is constant for specific materials that are in contact with each other.
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The formula for calculating friction is Ff = µFN.
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The direction of the coefficient of static friction (µs) is always opposite the force that tries to move the object.
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In a free-body diagram, the maximum value of static friction can be calculated using the formula Fs ≤ µsFN.
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The coefficient of static friction (µs) depends on the nature of the surface, where a rough surface has a higher µs compared to a slippery surface.
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