Work sheet (6) Chapter (11) Section (1)
Subject
Name
Date
Grade
G11
Cluster
Physics
Core
I-Choose the best answer:
1. The diagram shows a man diving into water.
Which form of energy increases as he falls?
A.
Chemical
B.
Kinetic
C.
Potential
D.
Magnetic
2. The diagram shows a cyclist riding along a hilly road. At which position does the cyclist have the least
gravitational (potential) energy?
A.
A
B.
B
C.
C
D.
D
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3. A cyclist travels down a hill from rest at point X without pedaling. The cyclist applies his brakes and the
cycle stops at point Y.
Which energy changes have taken place between X and Y?
A.
Kinetic → Thermal → Gravitational potential
B.
Kinetic → Gravitational potential → Thermal
C.
Gravitational potential → Thermal → Kinetic
D.
Gravitational potential → Kinetic → Thermal
4. Which of the following is not used to calculate Gravitational Potential Energy?
A.
Mass of an objects
B.
Gravitational acceleration.
C.
Height of an object above a reference level
D.
Speed of an object.
5. What type of energy increases as the apple falls down?
A.
Chemical potential energy
B.
Kinetic energy
C.
Gravitational potential energy
D.
Rest energy
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6. A 4 kg book falls to the ground from a 1.6 m high desk. What is the work done by the gravity on the book?
A.
63 J
B.
31 J
C.
6.4 J
D.
3.2 J
7. . How much work would have to be done on a truck with a kinetic energy of 2X10 4 J to reduce its kinetic
energy by half?
A.
1X102 J
B.
1X104 J
C.
4X104 J
D.
2X102 J
8. A large chunk of ice with mass 12.0 kg falls from a roof 6.00 m above the ground. Ignoring air resistance,
what is the speed of the ice when it reaches the ground?
A.
12.1 m/s
B.
10.8 m/s
C.
12.5 m/s
D.
7.67 m/s
9. A 75-kg rock climber first climbs 25 m to the top of a quarry, and then descends 75 m from the top to the
bottom of the quarry. If the initial height is the reference level, what is the potential energy at the bottom?
A.
-3.7×104
B.
-5.5×104 J
C.
1.8×104 J
D.
3.7×104 J
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Question II Graph Analysis
Use the figure below to answer questions 10 -14,
mass of the block = 0.02 kg
10. At which point does the block have both kinetic
and Potential energy? ______________
11. At which point does the block have the
maximum amount of kinetic energy?
_________________
12. What type of energy does the block have
at point A?
13. Calculate the GPE of the block at point A.
14. What is the kinetic energy of the block at point C
15. A pole-vaulter runs along a track. At the end of the track, he places a pole into the ground as shown in
the figure below and uses the pole to push himself vertically upwards.
What are the energy changes taking- place as he jumps to the maximum height?
__________________________________________
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Use the figure below to answer questions 14 - 16
A test rocket is fired vertically upwards from rest.
Its engine can apply a force of 8.5 x 107 N.
The rocket is designed in such a way that the
rocket fires until it reach a height of 2.4 km.
16. What was the potential energy of the rocket before it was fired?
17. Calculate the potential energy of the rocket when engine was shut down?
18. How much work was done by the engine to push the rocket up to 2.4 km?
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