Name:______________________ Score:
Regents Physics
Worksheet 3.2.5 – Mechanical Power (10 points)
Show all work – multiple choice answers MUST be proven for full credit!
10
1. A 10 kilogram sled is pulled across a frictionless surface
with a force of 50 newtons for a distance of 10 meters. The
pull is applied to the sled for a time of 2.0 seconds.
a. What amount of work is done on the sled?
[500 J]
b. What is the power generated in doing this work?
[250 W]
3. As the time for a person to run up a flight of stairs
increases, the power developed by the person
(1) increases
(2) decreases
(3) remains the same
Proof: Explain your reasoning / show calculations.
4. A 45 kilogram bicyclist climbs a hill at a constant speed of
2.5 meters per second by applying an average force of 85
newtons. Approximately how much power does the
bicyclist develop?
(1) 210 W (3) 1400 W
(2) 110 W (4) 1100 W
Proof: Show calculations.