Download Conservation of Energy

Conservation of Energy
Class:
Name:
1.
___________
Date:
The diagram shows a cart at four
positions as it moves along its track.
At which positions is the sum of the
potential energy and kinetic energy of
the cart the same?
3.
As the pendulum swings from position A
to position B as shown in the diagram,
what is the relationship of kinetic energy
to potential energy? [Neglect friction.]
(1) The kinetic energy decrease is more
than the potential energy increase.
(1) A and B, only
(2) The kinetic energy increase is more
than the potential energy decrease.
(2) B and C, only
(3) The kinetic energy decrease is equal
to the potential energy increase.
(3) C and D, only
(4) all positions, A through D
2.
(4) The kinetic energy increase is equal
to the potential energy decrease.
As a pendulum moves from the bottom
of its swing to the top of its swing, the
4.
(2) kinetic energy of the pendulum
remains the same
An object 10 meters above the ground
has Z joules of potential energy. If the
object falls freely, how many joules of
kinetic energy will it have gained when
it is 5 meters above the ground?
(3) potential energy of the pendulum
decreases
(1) Z
(1) kinetic energy of the pendulum
increases
(4) potential energy of the pendulum
increases
page 1
(2) 2Z
(3)
Z
2
(4) 0
5.
As an object falls freely near the Earth's
surface, the loss in gravitational potential
energy of the object is equal to its
8.
A cart of mass M on a frictionless track
starts from rest at the top of a hill having
height h1 , as shown in the diagram.
What is the kinetic energy of the cart
when it reaches the top of the next hill,
having height h2 ?
(1) loss of height
(2) loss of mass
(3) gain in velocity
(1) Mgh1
(4) gain in kinetic energy
(2) Mg (h1
h2 )
(3) Mg (h2
h3 )
(4) 0
6.
The diagram shown represents a
frictionless track. A 10-kilogram block
starts from rest at point A and slides
along the track.
9.
As the block moves from point A to
point B, the total amount of gravitational
potential energy changed to kinetic
energy is approximately
(1) 5 J
(2) 20 J
(3) 50 J
(4) 500 J
In the accompanying diagram, an average
force of 20. newtons is used to pull back
the string of a bow 0.60 meter.
As the arrow leaves the bow, its kinetic
energy is
7.
What is the approximate potential energy
of the block at point C ?
(1) 20 J
(2) 200 J
(3) 300 J
(4) 500 J
Class: ___________
page 2
(1) 3.4 J
(2) 6.0 J
(3) 12 J
(4) 33 J
Conservation of Energy
10.
The accompanying diagram shows a
moving, 5.00-kilogram cart at the foot of
a hill 10.0 meters high. For the cart to
reach the top of the hill, what is the
minimum kinetic energy of the cart in
the position shown? [Neglect energy loss
due to friction.]
12.
A 55.0-kilogram diver falls freely from a
diving platform that is 3.00 meters above
the surface of the water in a pool. When
she is 1.00 meter above the water, what
are her gravitational potential energy and
kinetic energy with respect to the water's
surface?
(1) PE = 1620 J and KE = 0 J
(2) PE = 1080 J and KE = 540 J
(1) 4.91 J
(2) 50.0 J
(3) PE = 810 J and KE = 810 J
(3) 250. J
(4) 491 J
(4) PE = 540 J and KE = 1080 J
13.
11.
A catapult with a spring constant of
1:0 104 newtons per meter is required
to launch an airplane from the deck of
an aircraft carrier. The plane is released
when it has been displaced 0.50 meter
from its equilibrium position by the
catapult. The energy acquired by the
airplane from the catapult during takeo
is approximately
(1) 1:3
103 J
(2) 2:0
104 J
(3) 2:5
103 J
(4) 1:0
104 J
Class: ___________
A block weighing 40. newtons is released
from rest on an incline 8.0 meters above
the horizontal, as shown in the diagram
below.
If 50. joules of heat is generated as
the block slides down the incline, the
maximum kinetic energy of the block at
the bottom of the incline is
page 3
(1) 50. J
(2) 270 J
(3) 320 J
(4) 3100 J
Conservation of Energy
14.
The diagram below shows a toy cart
possessing 16 joules of kinetic energy
traveling on a frictionless, horizontal
surface toward a horizontal spring.
15.
A wooden crate is pushed at constant
speed across a level wooden oor. Which
graph best represents the relationship
between the total mechanical energy of
the crate and the duration of time the
crate is pushed?
(1)
If the cart comes to rest after compressing
the spring a distance of 1.0 meter, what
is the spring constant of the spring?
(1) 32 N/m
(2) 16 N/m
(3) 8.0 N/m
(4) 4.0 N/m
(2)
(3)
(4)
Class: ___________
page 4
Conservation of Energy
16.
Base your answer(s) to the following
question(s) on the information below.
17.
A boy pushes his wagon at constant
speed along a level sidewalk. The graph
below represents the relationship between
the horizontal force exerted by the boy
and the distance the wagon moves.
A wound spring provides the energy to
propel a toy car across a level oor.
At time ti , the car is moving at speed
vi across the oor and the spring is
unwinding, as shown below. At time tf ,
the spring has fully unwound and the car
has coasted to a stop.
Which statement best describes
the-transformation of energy that occurs
between times ti and tf ?
(1) Gravitational potential energy at ti
converted to internal energy at tf .
As the boy pushes the wagon, what
happens to the wagon's energy?
(2) Elastic potential energy at ti is
converted to kinetic energy at tf .
(3) Both elastic potential energy and
kinetic energy at ti are converted to
internal energy at tf .
(1) Gravitational potential energy
increases.
(2) Gravitational potential energy
decreases.
(4) Both kinetic energy and internal
energy at ti are converted to elastic
potential energy at tf .
(3) Internal energy increases.
(4) Internal energy decreases.
Class: ___________
page 5
Conservation of Energy
18.
A ball is dropped from the top of a
cli . Which graph best represents the
relationship between the ball's total
energy and elapsed time as the ball falls
to the ground? [Neglect friction.]
19.
(1)
A child, starting from rest at the top of
a playground slide, reaches a speed of
7.0 meters per second at the bottom of
the slide. What is the vertical height of
the slide? [Neglect friction.]
(1) 0.71 m
(2) 1.4 m
(3) 2.5 m
(4) 3.5 m
(2)
(3)
20.
(4)
Which statement describes the kinetic
energy and total mechanical energy of a
block as it is pulled at constant speed up
an incline?
(1) Kinetic energy decreases and total
mechanical energy increases.
(2) Kinetic energy decreases and total
mechanical energy remains the same.
(3) Kinetic energy remains the same and
total mechanical energy increases.
(4) Kinetic energy remains the same
and total mechanical energy remains
the same.
Class: ___________
page 6
Conservation of Energy
Problem-Attic format version 4.4.183
c 2011–2013 EducAide Software
_
Licensed for use by B Fejzo
Terms of Use at www.problem-attic.com
Class: ___________
1.
Answer:
4
2.
Answer:
4
3.
Answer:
4
4.
Answer:
3
5.
Answer:
4
6.
Answer:
4
7.
Answer:
2
8.
Answer:
2
9.
Answer:
3
10.
Answer:
4
11.
Answer:
1
12.
Answer:
4
13.
Answer:
2
14.
Answer:
1
15.
Answer:
1
16.
Answer:
3
17.
Answer:
3
18.
Answer:
4
19.
Answer:
3
20.
Answer:
3
Conservation of Energy
06/27/2013