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WorksheetsYear 7 Energy Assessment
Total questions: 26
Worksheet time: 30mins
Which word describes a resistive force caused by 2 objects in contact
Friction
Reaction force
Upthrust
Weight
What is the best definition of resultant force?
Overall force
The sum of all the forces
The difference between the forces
Balanced forces
Which of these are non-contact forces? (2 marks)
Magnetic force
Gravity
Air resistance
Friction
What do we call the place on an object where the mass is thought to be concentrated?
Centre of mass
Pivot
Epicentre
Middle point
What words describes a turning force?
Moment
Pivot
Balanced force
Seesaw
What 2 units can be used for energy? (2 marks)
Joules(J)
kilowatt hours (kWh)
Watts
Volts
Which of these are types of energy stores? (2 marks)
chemical
elastic
light
electrical
Which of these are energy stores? (2 marks)
Magnetic
Thermal
Light
Sound
What is the principle of conservation of energy?
Energy cannot be created or destroyed
No energy should be wasted
All energy is useful
Energy cannot be lost
What happens to most wasted energy in any energy transfer?
It warms up the surroundings
It disappears
It stops being energy
Nothing
Which item will transfer energy from a chemical energy store to a kinetic energy store?
car
light bulb
turbine
roller coaster
Which of these items will transfer energy from a gravitational energy store to kinetic energy store?
Roller Coaster
Kettle
Car engine
Car brakes
What does the arrow labelled "light energy" represent?
The useful energy
The wasted energy
The total energy
the efficiency
What does the smaller arrow peeling off represent?
The wasted energy
The useful energy
The total energy
The efficiency
What does it mean when we say that energy is dissipated?
Energy is spread out into the surroundings
Energy is conserved
Energy is lost
Energy is made
Which of these are wasted energies in a firework?
Thermal
Light
Gravitational
Kinetic
What are the units of power?
Watts (W)
Joules(J)
Energy
Newtons
Which is the best definition of power?
The rate at which energy is transferred
Strength
Using energy quickly
The amount of energy transferred
How do we convert minutes to seconds?
multiply by 60
divide by 60
multiply by 100
divide by 60
What are the units used for work done?
Joules(J)
Watts (W)
Newtons (N)
Metres(m)
Which of these quantities are used to calculate power? (2 marks)
work done
Force
Distance
Time
A box with a weight of 12N is moved 2m along the floor. How much work is done?
24J
24W
6J
0.12J
Calculate the efficiency of a hair dryer which takes in 3000J of energy per second and transfers 600J as useful heat energy.
600÷3000
600×3000
3000÷600
How much energy is used when heating water for 2 hours using a 5 kW immersion heater?
10kWh
10J
2.5kWh
2.5J
Which of these methods would increase the efficiency of a bicycle? (2 marks)
Lubricate the chain
Pedal faster
Get thinner tyres
Get thicker tyres
Which of these would need more work to be done?
Move a 2N bag by 12m
Move a 8N bag by 1m
Move a 3N bag by 3m
Move a 4N bag by 2m
