You have a choice of moving a box by either pulling with a rope or pushing from

Question

You have a choice of moving a box by either pulling with a rope or
pushing from behind. Assume that in either case, the propelling force
acts at an angle of 45° to the ground.
A) Draw the free-body diagrams and write the net force equations for
each alternative.
B) Find the expressions for the force of friction and the applied force
needed to maintain the box at constant speed for each alternative.
Which method do you think is more efficient? Why? Explain how you
interpret ‘efficient’ in your answer.

Explanation / Answer

http://www.cramster.com/answers-jun-11/physics/physics-pull-push-sled-choic-moving-sled-pulling_1363292.aspx?rec=0

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