A. The force of gravity does negative work when the worker lifts the bucket.
B. The painter does positive work on the bucket when carrying it horizontally at constant speed.
C. The painter does positive work on the bucket when setting it down.
A. the force is in the same direction as the displacement.
B. the force is perpendicular to the displacement.
C. the component of the force that does work is in the direction opposite the displacement.
D. the component of the force that does work is perpendicular to the displacement.
A. The force of gravity is the only force doing work on the parachutist.
B. Air resistance is the only force doing work on the parachutist.
C. No forces are doing work on the parachutist.
D. No net work is done on the parachutist.
a. Holding a heavy box requires a lot of work.
b. A scientist works on an experiment in the laboratory.
c. Sam and Rachel pushed hard, but they could do no work on the car.
d. John learned that shoveling snow is hard work.
A. the displacement is not zero.
B. the displacement is zero.
C. the force is zero.
D. the force and displacement are perpendicular.