a. A block with a mass m is pulled along a horizontal surface for a distance x by a constant force at an angle θ with respect to the horizontal. The coefficient of kinetic friction between block and table is μk. Is the force exerted by friction equal to μkmg? If not, what is the force exerted by friction? (Assume θ is measured above the horizontal.)  b. (b) How much work is done by the friction force and by ? (Don't forget the signs. Use the following as necessary: F for the magnitude of , g, m, x, θ and μk.) c. (c) Identify all the forces that do no work on the block. (Select all that apply.) mg  F cos(θ) friction Fk  n F sin(θ)

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.