WorksheetsYear 7 - Energy Around Us Revision
Total questions: 44
Worksheet time: 22mins
Which of the following is an energy source?
The sun
The road
The shirt you wear
The cup of water
Energy can best be described as:
Energy is an invisible force that powers everything
Energy is the ability to do work
Energy is a source of power
Which of the following is NOT an example of energy?
Sound
Electrical
Heat
Gravity
What is gravitational potential energy?
Any object that requires falling to release energy
Any object that is raised up into a position where it can fall, roll or slide downwards
Any object that stores energy in the bottom of the object
Where is elastic potential energy stored?
Energy stored in things like batteries
Energy stored in things like fire
Energy stored in things like compressed springs
Where is chemical energy stored?
Chemical substances found in batteries, wood and petrol
Any object that falls due to gravity
Any object that compresses or stretches
What do you call stored energy?
Potential
Kinetic
The ___________ something is, the more gravitational potential energy it has
Smaller
Lighter
Heavier
The faster something is moving, the more __________ energy it has
Kinetic
Potential
Elastic
Gravitational
Energy is often ___________ from one object to another
Moved
Shifted
Adapted
Transferred
Energy can also be ____________ from one type to another
Adapted
Transformed
Shifted
Moved
What is energy measured in?
Joules (J)
Newton (N)
Kilograms (Kg)
Grams (g)
What is the 'Law of Conservation of Energy'?
Energy can be transferred and transformed in all sorts of ways, it can be created or destroyed
Energy can be transferred and transformed in all sorts of ways, it can never be created or destroyed
In Sankey Diagrams, what is the direction of the flow of energy?
Left to Bottom right
Right to left
Left to right
In sankey Diagrams, the thickness of the arrows indicate what?
The amount of energy
The amount of force
The quality of energy
The quality of force
Which step in playing a guitar involves energy transfer without transformation?
The contraction of the muscles needed to move the player's fingers
The generation of sound by the vibrating strings
The plucking of the strings by the player's fingers
When someone uses a bow to shoot an arrow, ____________ energy is/are useful and ____________ energy is/are waste
Elastic and sound; heat and kinetic
Kinetic; elastic and heat
Chemical, kinetic and elastic; none
Chemical, kinetic and elastic; heat and sound
What is the formula for efficiency?
efficiency=useful energytotal energy input×100
Efficiency=total input energyuseful energy×100
For every 300 J of chemical energy supplied by the battery of one particular model of electric car, 45 J is lost as heat and the rest is transformed into electrical energy to power the motor. How efficient is the transformation from chemical to electrical energy?
10%
15%
85%
90%
For every 200J of energy in a battery, only 150J is used as electricity, the rest is used for heat. what is the efficiency of the battery?
20%
25%
70%
75%
An electric car has 500J of electrical energy stored, 200J is wasted. What is the efficiency of the car?
70%
60%
50%
40%
In the diagram, how much energy is being wasted?
10J
20J
80J
90J
In the diagram, calculate the efficiency of the globe
10J
20J
80J
90J
What is a hybrid car?
A car that runs on water and an internal combustion engine
A car that runs on an electric motor only
A car that has both an internal combustion engine and an electric motor
The best way to visualise energy transformation is through
Snake diagrams
Sankey diagrams
Efficiency equation
Light globe diagrams
What is thermoelectrics?
The conversion of chemical energy into electrical energy
The conversion of electrical energy into heat
The conversion of heat energy directly into electrical energy
Which of the following are types of potential energy?
Heat
Gravitational
Light
Sound
Which of the following are NOT examples of energy transformations?
A flower vase falling off a shelf
A child riding a bicycle
A foot kicking a ball
A bonfire burning
In every energy transformation, some energy is wasted. This wasted energy is mainly in the form of ____________ energy
Gravitational
Kinetic
Light
Heat
An electric kettle boiling water is a transformation between which two energy types?
Electrical to heat
Chemical to kinetic
Heat to electrical
Electrical to chemical
A boat motoring across a lake transforms 1600 J of chemical energy in its fuel into 950 J of heat energy, 250 J of sound energy, and 400 J of kinetic energy. What is the percentage efficiency of the boat?
75%
15%
25%
60%
A Sankey diagram for a kitchen blender is shown. Assuming that the blender is working as expected, what will A, B, and C stand for?
A: kinetic energy; B: kinetic energy; C: chemical energy
A: electricity; B: kinetic energy; C: heat
A: whole food; B: blended food; C: juice
A: heat; B: kinetic energy; C: electricity
Can the universe ever lose or gain energy?
No, the total amount of energy never changes
Yes, it can gain it and lose it, at different times
Yes, it can lose it but not gain it
Yes, it can gain it but not lose it
When chemical bonds break and reform, energy – as heat and light – is often released. This is possible because:
Molecules contain heat and light stored in them
Chemical potential energy is stored in the way the atoms bond within molecules, and this is converted to heat and light
Chemical reactions take in energy from the surroundings and convert it into heat and light
We can tell different types of energy from one another by:
Seeing what the different types of energy do
Gathering the energy in containers and measuring the differences
Measuring their different temperatures
Using the data in the graph, calculate how many times more energy efficient a compact fluorescent globe is compared to an incandescent globe
3x
5x
7x
9x
Climbing stairs has ________ energy input and __________ as energy output
Potential, heat
Potential, kinetic
Kinetic, heat
Which of the following statements about energy are true?
You can't see energy but you can see what it does
You can tell different types of energy from one another because they have different temperatures.
You can hold a bunch of energy in your hands
Which of the following is NOT a type of energy?
Chemical
Elastic
Gravitational
Fire
Chemical energy is a form of:
Heat
Potential energy
Kinetic energy
Gravitational energy
Air molecules are constantly bouncing off our skin. On a cold day:
Our skin molecules have more kinetic energy than the air molecules
Our skin molecules have less kinetic energy than the air molecules
The skin and air molecules have the same amounts of kinetic energy, but the skin has more heat in it than the air
Metal block A has temperature 25°C and metal block B has temperature 55°C
The particles are moving the same amount in both blocks, but B has more heat in it
There is more kinetic energy in the particles in A
The particles in A are moving faster than the particles in B
The particles in B are moving faster than the particles in A
We need energy to move, which we get from food.
Food contains chemical energy, which our bodies convert to kinetic energy
Food contains kinetic energy, which our muscles are able to use
Food contains heat energy, which our bodies convert to kinetic energy
An electric drill converts 2000 J of electrical energy into:
400J of kinetic energy in the turning of the drill bit, 800J of sound in the noise the drill makes, 800J of heat.
What is the energy efficiency of the drill?
10%
20%
40%
80%
