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1. A 20 kg box is pushed by a 100 N force directed at 30 degrees to the horizontal over a distance of 10 m. The coefficient of friction between the box and the ground is 0.5. a. How much work is done by the normal force? b. How much work is done by the force of gravity? c. How much work is done by the applied force? d. How much work is done by friction? e. What is the work done by the net force acting on the object? 2. a. How much work is required to move a 10 kg object from the ground to a height of 40m if it is moved at a constant velocity? b. How much work does gravity do?
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1. a) work done by normal force= 0 J
b) work done by gravity=0 J
c) work done by applied force= 866.02 J
d) work done by friction force= -730 J
e) work done by net force= 136 J
2. a) required work =3920 J
b) work done by gravity= -3920 J
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