Question

2 movers push bureaus the same distance across a room with a rough wooden floor. The movers exert equal constant forces over the entire distance. The bureaus are also identical, except that mover A's bureau is on casters so that it can be rolled, but mover B's bureau must be slid. a) compare the amounts of work done by the two movers to get their bureaus across the room. explain b) compare the impulses the two movers deilver to their bureus to get them acrosss the room. explain

Answer 1

work done against friction by mover A whose bureau is on rollers is less as friction contributes in rolling , hence increases the rotational kinetic energy of bureau , however in mover B bureau where there are no rollers he has to skid the bureau against friction by doing extra work as his work is not compensated by the rotational kinetic energy therefore work done in moving the bureau by A is less than work done by B

mover A has to apply force for a short time to get same kinetic energy or work done as mover B has to apply same force for more time so impulse spplied by A is less than that mover B.

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