Transcript Work and Energy - college physics

Physics Quiz
ENERGY
Each question is multiple choice. Select the best response to
the question by pressing the button to the left of your choice.
If your answer is correct, you will hear an applause.
Use the forward and backward buttons at the lower corner of
the slides to advance questions.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
1. What is the SI unit of energy?
A. newton
B. erg
C. joule
D. dyne
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
2. Kinetic energy is the mechanical energy of __________ .
A. motion
B. position
C. mass
D. acceleration
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
3. What factors are needed to compute work done?
A. the mass of an object and its speed
B. the speed of an object and how far it’s moved
C. the kinetic energy of an object and its direction
D. the net force acting on an object, its displacement, and the
angle between the two.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
4. Which equation below correctly computes work?
A. W  Fv
B. W  F cos( ) x
C. W  F cos()v
D. W  F sin()x
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
5. The net work done on an object is
A. the work done by internal forces.
B. the work done by the net force acting on the object.
C. the sum of all the object`s energies.
D. the change in the object`s mechanical energy.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
6. Which of the following is not a mechanical energy, per se?
A. work
B. potential energy
C. kinetic energy
D. potential and kinetic energies added together
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
7. The symbol used to represent kinetic energy is
A. E
B. PE
C. U
D. KE
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
8. What does the following expression represent?
KE
A. The total kinetic energy of an object.
B. The final kinetic energy of an object.
C. The amount of kinetic energy lost to motion.
D. The change in an object’s kinetic energy.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
9. What does the following expression equal?
KE
A. the change in potential energy
B. the change in total energy
C. the net work done
D. the net force acting
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
10. Work and energy are ________ quantities.
A. vector
B. scalar
C. tensor
D. pseudo
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
11. What is potential energy?
A. It is the mechanical energy of an object due to its position.
B. It is the mechanical energy of an object due to its motion.
C. It is the change in kinetic energy of an object.
D. It is the net mechanical energy of an object.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
12. If an object is moved so that its elevation above the ground
increases, how does its gravitational potential energy change?
A. it remains constant
B. it decreases
C. it increases
D. there is not enough information to tell
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
13. If the height above the ground of an object is doubled, the
object`s potential energy ________ .
A. increases by a factor of 4
B. decreases by a factor of 4
C. decreases by a factor of 2
D. increases by a factor of 2
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
14. Which characteristic listed below, is not a characteristic of the
work done by a conservative force?
A. the work done moving an object is independent of the path
taken between start and finish points
B. the work done moving an object around any closed path is
zero
C. the work done moving an object depends only on the start
and end points of the motion
D. the work done moving an object depends on the mass of the
object and not on the start and finish points
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
15. Which force listed below is a conservative force?
A. air resistance
B. friction
C. spring force
D. tension
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
16. What do conservative forces conserve?
A. potential energy
B. kinetic energy
C. total mechanical energy
D. net work
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
17. If a mass attached to a spring is displaced x from equilibrium
and has a net force of Fo acting on it, what force will act on the
mass when it is displaced 2x from equilibrium?
A. 2Fo
B. Fo/2
C. Fo/4
D. 4Fo
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
18. Which equation is not an expression of the work-energy
theorem?
A.
KE  PE  WNC
B.
KE  WNET
C.
E  WNC
D.
PE  WC
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
19. A flowerpot falls from a windowsill 10.0 m above the ground. At
what height above the ground will the flowerpot`s kinetic and
potential energies be equal?
A. 10.0 m
B. 5.0 m
C. 0.0 m
D. They will never be equal because they are conserved.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
20. Average Power is __________ .
A. the ratio of work to total mechanical energy
B. the ratio of kinetic to potential energy
C. the rate at which force is applied
D. the rate at which work is done.
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
21. What is the SI unit for power?
A. joule
B. watt
C. erg
D. kilovolt
START
NEXT
PREVIOUS
SLIDE
Quiz by Dr. John Dayton
QUIT
22. How is instantaneous power calculated?
A.
B.
C.
D.
P  F x
P  W x
F
P
v
P  Fv
START
NEXT
PREVIOUS
SLIDE
This is the last question of this quiz.
Quiz by Dr. John Dayton
QUIT