For each of the following cases indicate whether the work done on the second obj

Question

For each of the following cases indicate whether the work done on the second object in each example will have a positive or a negative value.
a. the road exerts a friction force on a speeding car skidding to a stop
b. a rope exerts a force on a bucket as the bucket is raised up a well
c. air exerts a force on a parachute as the parachutist slowly falls to Earth
d. the earth exerts a force on a bobsled as it moves down a track

Determine whether work is being done in each of the following examples
a. a train engine pulling a loaded boxcar initially at rest
b. a tug of war that is evenly matched
c. a crane lifting a car

Explanation / Answer

a) negative b)positive c)negative work d)negative 2)a)work is done b) no work (ZERO) c) work is done

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