Power, work and Conservation of Energy discussion Please answer all the questions Questions that have answers, please let me know if they are right or wron

Power, work and Conservation of Energy discussion Please answer all the questions Questions that have answers, please let me know if they are right or wrong. If wrong give me the correct answer, if correct just say correct. NH
1/29/19
Class:
Date:
Work and Energy
Math Skills
Work
A crate with a mass of mis on a ramp that is inclined at an angle of 30° from the
horizontal. A force with a magnitude of F directed parallel to the ramp is used to pull #
the crate with a constant speed up the ramp a distance of d.
W-Fascos
Tv
130°
1. What is the work done on the crate by the applied force F?
2. What is the work done on the crate by the gravitational force exerted on the crate
by Earth?
3. What is the work done on the crate by the normal force, with a magnitude of F..
exerted on the crate by the ramp? (Hint: recall that the normal force is
perpendicular to the surface of the ramp.)
4. What is the work done on the crate by the frictional force F?
5. What is the total force acting on the crate?
6. What is the work done on the crate by the total force?
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Holt McDougal Physics
25
.
Study Guide
Name:
Class:
Date:
Work and Energy
Diagram Skills
KE Žmv² P= ² kx²
MEi #r
Energy
PE= mgh
MEKE + EPE
(KEEPE – RE
As shown in the diagram, a block with a mass of m slides on a frictionless, horizontal
surface with a constant velocity of v;. It then collides with a spring that has a spring
constant of k. The block fully compresses the spring, comes to rest briefly, and then
moves in the opposite direction with a velocity of -v;
Vi →
x=0
v=0
wwwy
Ca)
(e)
w
www
(b)
(d)
14
1. Examine the situation shown in part (a) of the diagram.
a. What is the kinetic energy of the block? KE Žm vi
b. What is the potential energy associated with the block’s position? Pte – KD-0
c. What is the mechanical energy for this system? mt
2. Examine the situation shown in part (b) of the diagram.
a. What is the kinetic energy of the block?_KE= m(o)=0
b. What is the potential energy associated with the block’s position? PE
. c. What is the mechanical energy for this system? Ô +3kxq
3. Examine the situation shown in part (e) of the diagram.
2. What is the kinetic energy of the block? KE = ? mu?
b. What is the potential energy associated with the block’s position? Psykx
c. What is the mechanical energy for this system?
4. Examine the situation shown in part (d) of the diagram.
a. What is the kinetic energy of the block?
b. What is the potential energy associated with the block’s position?
c. What is the mechanical energy for this system?
Houghton Mifflin Harcourt Publishing Company
Holt McDougal Physics
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Study Guide
Class:
Date:
Name:
Work and Energy
Diagram Skills
Conservation of Energy
A roller-coaster car with a mass of m moves along a smooth track as diagrammed in
the graph below. The car leaves point A with no initial velocity and travels to other
points along the track. The zero energy level is taken as the energy of
point A.
G
NA
8
C
a म
IgN
D
E
1. a. What is the car’s kinetic energy at point A?
b. What is the potential energy associated with the car at point A?
c. What is the car’s kinetic energy at point B?
d. What is the potential energy associated with the car at point B?
2. a. What is the speed of the car at point A?
b. What is the speed of the car at point B?
3. Assume the mass of the car is 65.0 kg and it starts at 30.0 m above the ground.
Use the graph above to find the kinetic energy, potential energy, and velocity for
points C, D, E, F, and G to complete the table.
Location KEA PE
PEocation Vacation
с
D
E
F
G
KE location
4. For each location, what do you notice about the sum KEA+PE, compared with
the sum Klocation + PEocation?
Houghton Mifflin Harcourt Publishing Company
Holt McDougal Physics
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Study Guide
Class:
Date:
Name:
Work and Energy
Concept Review
Power
A man accidentally knocks a flowerpot off a high window ledge. The flowerpot drops
straight down under the influence of gravity.
1. What is the velocity of the flowerpot as it falls?
2. What is the distance the flowerpot falls?
3. What is the force acting on the flowerpot as it falls?
4. What is the work done on the flowerpot as it falls?
5. Assume the flowerpot has a mass of
5.00 kg and drops a total distance of
15.0 m. In the space provided, graph the
work done on the flowerpot as a function of
time.
6. The flowerpot described in item 5 falls for a total of 1.75 s. What is the power
delivered by the flowerpot in this interval?
(g = 9.81 m/s)
Houghton Mifflin Harcourt Publishing Company
Holt McDougal Physics
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Study Guide

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