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OCR 21st Century P2
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Cards (57)
What are the different sources of energy mentioned?
Thermal
, light,
chemical
,
nuclear
, sound,
kinetic
,
elastic
,
potential
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What is thermal energy?
Energy in
heated
objects like kettles
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How is light energy used?
Helps to see, like in
bulbs
and torches
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What is electrical energy?
Energy due to the flow of
charge
or
current
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What is chemical energy?
Energy stored in
chemical bonds
, like food
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What is sound energy?
Energy due to
vibrations
, like in speakers
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What is nuclear energy?
Energy stored in the
nucleus
of an atom
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What is kinetic energy?
Energy due to
movement
, like in
roller coasters
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What is potential energy?
Energy due to
position
, like a raised ball
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What is elastic energy?
Energy stored in
stretched
objects like springs
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What does the law of conservation of energy state?
Energy is neither
created
nor
destroyed
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How does energy transfer occur in a pendulum?
Kinetic energy
converts to
potential energy
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What happens to energy in a roller coaster?
Potential energy
converts to
kinetic energy
when falling
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What is the formula for work done?
Work done =
force
×
distance
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What is the unit of work done?
Joules
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What is the formula for potential energy?
Potential energy =
mgh
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What does 'm' represent in the potential energy formula?
Mass
of the object in
kilograms
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What is the value of 'g' in potential energy calculations?
10 m/s²
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What is the formula for kinetic energy?
Kinetic energy = ½
mv²
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What is the formula for elastic potential energy?
Elastic potential energy = ½
k
e²
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What is the formula for energy?
Energy =
power
× time
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What is the unit of power?
Watts
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What is the formula for efficiency?
Efficiency = (
useful output
/ total input) × 100
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How do you calculate work done with a 2 Newton force over 2 meters?
Work done =
4 joules
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How do you calculate kinetic energy for a 2 kg mass at 3 m/s?
Kinetic energy =
9 joules
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How do you calculate potential energy for a 2 kg mass at 5 meters?
Potential energy
=
100 joules
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How do you calculate energy dissipated by a 10 volt bulb in 2 seconds?
Energy
= 1200
joules
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What does Hooke's Law state?
Force
is directly proportional to
extension
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What is the relationship between force and extension in Hooke's Law?
Linear relationship until a
limit
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What is energy efficiency?
Ratio
of useful output to total input
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How can friction be prevented?
Lubricate
, paint, or smooth
surfaces
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What are the three methods of heat transfer?
Conduction
,
convection
,
radiation
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What is conduction?
Heat transfer through direct contact of
particles
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What is convection?
Heat transfer through
fluid
movement
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What is radiation?
Heat transfer through
electromagnetic
waves
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What is the greenhouse effect?
Warming of Earth's surface by
greenhouse gases
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What do greenhouse gases do?
Trap heat and prevent it from
escaping
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What are renewable energy sources?
Sources that can be
replenished
and won't run out
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What are non-renewable energy sources?
Sources that cannot be
replenished
and will run out
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What is biofuel?
Fuel
generated
from plant resources
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See all 57 cards
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