Download Name - malmeida

Name: _____________________________________________________________________________ Block: __________ Date: ______________________
Mr. Almeida – Conceptual Physics
Work & Energy Exam – Review Sheet
1.
After dinner, a 60.0-kilogram student climbs the 5.0-meter flight of stairs to her bedroom.
a. How much work does she do in ascending the stairs?
b.
What is her gravitational potential energy relative to the dining room once she is upstairs?
c.
If it took her 12.0 seconds to ascend to the top of the stairs, how much power did she generate?
d.
The next night, after eating a slightly smaller dinner, she climbs up to her bedroom in only 8.0 seconds.
Compare and contrast both the work done and the power generated by her on the two nights.
2.
If 3.2 J of work is done to lower a window shade a distance of 0.8 m, how much force is exerted on the window
shade?
3.
During a high-stakes pool game, Kurt hits a 0.50-kilogram billiard ball off the edge of a 0.72-m high pool table. It
strikes the floor with a speed of 6.0 m/s.
a. How much kinetic energy does the ball possess just before it hits the floor?
b.
What is the gravitational potential energy of the ball (relative to the floor) just before it hits the floor?
c.
What is the mechanical energy of the pool ball just before it hits the floor?
d.
How much gravitational potential energy did the ball have (relative to the floor) when it was on the table?
e.
Assuming that a negligible amount of mechanical energy was converted to thermal energy (heat) during the
pool ball’s descent, how much kinetic energy did the ball have when it first left the table? (Hint: Use the Law
of Conservation of Energy)
f.
How fast was the ball moving when it left the table?
4.
Compute the kinetic energy of a 20.0 kilogram greyhound that is capable of running at a speed of 16.0 m/s.
5.
Before:
After:
A 4.0-kg box sitting on a frictionless surface is compressed 8.0 cm (0.08 m) into a stiff spring of spring constant
k=1600
=1600 N/m. With what speed does it leave the spring upon being released from rest?
6.
A 2.0-kg box sliding along a frictionless surface at 6
6.0
.0 m/s begins to slide up a steep incline. To what vertical
height does the box ascend before stopping
stopping?
7. As the 2 kg pendulum bob in the diagram swings to and fro, its height and speed change. Use energy
equations and the data to determine the blanks below:
8.
At her highest point, a girl on a swing is 2.2 m above the ground, and at he
herr lowest point she is 1 m
above the ground. What is her maximum velocity?
9.
A 150 kg roller coaster car starts from rest at the top of the track at 37 m of height. Determine the
following information about the car at points B (0 m), C (8 m), and D (5 m).
A: PE = _______________
KE = _______________
v = _______________
B: PE = _______________
KE = _______________
v = _______________
C: PE = _______________
KE = _______________
v = _______________
D: PE = _______________
KE = _______________
v = _______________