An object with a mass of #5 kg# is on a plane with an incline of # - pi/8 #. If it takes #8 N# to start pushing the object down the plane and #3 N# to keep pushing it, what are the coefficients of static and kinetic friction?
The static coefficient of friction is
The kinetic coefficient of friction is
For our diagram, If we apply Newton's Second Law up perpendicular to the plane we get: Initially it takes And the friction is related to the Reaction (Normal) Force by Once the object is moving the driving force is reduced from And the friction is related to the Reaction (Normal) Force by So the static coefficient of friction is
the kinetic coefficient of friction is
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The coefficient of static friction is , where is the angle of the incline. Given , . The coefficient of kinetic friction is , where is the angle whose tangent is the ratio of the force needed to keep the object moving to the force pressing the object against the incline. Therefore, .
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- An object with a mass of #10 kg# is on a plane with an incline of # - pi/4 #. If it takes #12 N# to start pushing the object down the plane and #4 N# to keep pushing it, what are the coefficients of static and kinetic friction?
- If an object with a mass of #10 kg # is moving on a surface at #15 ms^-1# and slows to a halt after # 4 s#, what is the friction coefficient of the surface?
- An object, previously at rest, slides #5 m# down a ramp, with an incline of #(3pi)/8 #, and then slides horizontally on the floor for another #15 m#. If the ramp and floor are made of the same material, what is the material's kinetic friction coefficient?
- An object with a mass of #5 # # kg# is on a surface with a kinetic friction coefficient of # 4 #. How much force is necessary to accelerate the object horizontally at # 6# #ms^-2#?
- If an object with a mass of #10 kg # is moving on a surface at #45 m/s# and slows to a halt after # 6 s#, what is the friction coefficient of the surface?
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