A boy pulls a sled along a straight

PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A boy pulls a sled along a straight, level path using a rope that always exerts a constant tension of

40\,\text{N}

. (i) The boy first pulls the sled forward for

15\,\text{m}

with the rope making an angle of

30^{\circ}

with the direction of motion. Calculate the work done in this part of the trip. (ii) He then pulls the sled back along the same line for

6\,\text{m}

while the rope now makes an angle of

120^{\circ}

with the direction of motion. Calculate the work done in this second part. (iii) Find the total work done by the boy on the sled for the entire out-and-back motion.

Related theory

Work by Constant Forces
Work done by a constant force
Work, Energy and Power
Work and energy
Work

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