A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q. The surface has a frictional force acting during this motion. How much work was done by friction during this motion? The student calculates the value to be Fdsinq. How does this value compare to the correct value?
a. It is the correct value.
b. It is too high.
c. It is too low.
d. The answer cannot be found until it is known whether q is greater than, less than, or equal to 45.
Question 2
A mover pushes a box of mass m = 56.0 kg along a horizontal floor a distance d = 2.50 m. The constant force exerted on the box by the mover makes an angle of 27.0 directed below the horizontal. Assume the floor is frictionless. If the work done by the mover is W = 200 J, what is the force exerted by the mover?
a. 89.8 N
b. 549 N
c. 616 N
d. 176 N
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