Energy Stores & Transfers Note Quiz
Name: __________________________
Date: __________ Class: ___________
_____ 1. This diagram shows an amusement park roller coaster ride (not drawn to scale).
The car becomes stuck at point P, which is 50 meters above the ground. To the relief of the
passengers, the car eventually moves again and passes point R at 20 m/s. Approximately how
high is point R? The car and its passengers have a combined mass of 700 kg (though the
question can be answered without this information).
A 35m/s
B 30m/s
C 25m/s
D 20m/s
_____ 2. Which of the following statements is closest to the meaning of the principle of
conservation of energy?
A Energy can only be stored or transferred
B Energy is created by energy stores
C Energy can be destroyed by transfers
D Energy can only be transferred
This diagram shows an amusement park roller coaster ride (not drawn to scale).
(a) On what part of the ride is the car moving slowest?
....................................................................................................................................................... [1]
(b) On what part of the ride is the car moving fastest?
....................................................................................................................................................... [1]
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2. Complete the table. For each description, write down the name of the associated energy and
state whether it is a store or transfer.
Description
energy of a moving object
energy in a hot object
energy in a fuel
energy that we can see
energy ·in a squashed spring
energy carried by an electric current
energy in the nucleus of an atom
energy escaping from a hot object
Name of energy
Store or transfer
3. This diagram represents an energy transfer.
Complete the following two word equations for this energy change:
(a) wasted energy = ______________ ______________
(b) efficiency = ______________ ______________
[2]
4. Scientists use a ballistic pendulum to work out the speed of a projectile that hits it. The block
has a mass of 4.7kg and moves with an initial speed of 1.24 m/s when it is hit.
(a) State the equation linking kinetic energy, mass and velocity.
....................................................................................................................................................... [1]
(b) Calculate the kinetic energy of the block.
[2]
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(c) As the block swings, it gains g.p.e. What is the maximum g.p.e. that can be gained by the
block.
....................................................................................................................................................... [1]
(d) Calculate the maximum height the block gains.
[2]
(e) It might not be easy to measure the height increase. Suggest another variable a researcher
could measure more easily and then use to get the height.
............................................................................................................................................................
....................................................................................................................................................... [1]
(f) Researchers find the kinetic energy of the projectile is much higher than the kinetic energy of
the block. What happened to the kinetic energy that was not transferred from the projectile to the
block?
............................................................................................................................................................
....................................................................................................................................................... [1]
5. This is the Sankey diagram for a 100 W light bulb
(a) Calculate the input energy to the power station
[1]
(b) Calculate the efficiency of the power station
[1]
(c) Calculate the efficiency of the light bulb
[1]
(d) State the energy dissipated (wasted) in the lamp
....................................................................................................................................................... [1]
6. State how energy is transferred from
(a) a toaster
............................................................................................................................................................
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....................................................................................................................................................... [2]
(b) a refrigerator
............................................................................................................................................................
....................................................................................................................................................... [2]
(c) an audio system
............................................................................................................................................................
....................................................................................................................................................... [2]
7. A 100 g steel ball falls from a height of 1.8 m onto a metal plate and rebounds to a height of
1.25 m. Calculate the
(a) potential energy of the ball before the fall (g = 9.8 m/s2)
[2]
(b) kinetic energy of the ball as it hits the plate
[1]
(c) velocity of the ball on hitting the plate
[3]
(d) kinetic energy of the ball as it leaves the plate on the rebound
[2]
(e) velocity of rebound.
[3]
8. A ball of mass 0.5 kg is thrown vertically upwards with a kinetic energy of 100 J. Neglecting air
resistance calculate
(a) the initial speed of the ball
[3]
(b) the potential energy of the ball at its highest point
[1]
(c) the maximum height to which the ball rises.
[3]
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