App. Physics - Work

For each of the following statements, identify the scientific meaning of work is intended.

1. A. Jack had to work against time as the deadline neared.

2. B. Jill had to work on her homework before she went to bed.

3. C. Jack did work carrying the pail of water up the hill.

Determine whether work is being done in each of the following examples:

1. A. a train engine pulling a loaded boxcar initially at rest.

2. B. a tug of war that is evenly matched.

3. C. a crane lifting a car.

For each of the following cases, indicate when the work done on the second object in each example will have a positive value.

1. A. The road exerts a friction force on a speeding car skidding to a stop.

2. B. A rope exerts a force on a bucket as the bucket is raised up a well.

3. C. Air exerts force on a parachute as the parachutist falls to Earth.

For each of the following cases, indicate when the work done on the second object in each example will have a negative value.

1. A. The road exerts a friction force on a speeding car skidding to a stop.

2. B. A rope exerts a force on a bucket as the bucket is raised up a well.

3. C. Air exerts force on a parachute as the parachutist falls to Earth.

Work is a form of energy

Units of work would be equivalent to a Newton times a meter.