GCSE Physics Paper 1

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Define the term 'system'
An object or a group of objects
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Give two energy stores that energy is transferred between when an apple falls from a tree
Transferred from: GPE and kinetic energy
Transferred to: kinetic energy and thermal energy
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What is the equation linking, elastic potential, spring constant and extension.
Elastic potential energy(J)= 0.5 x spring constant (N/m) x extension^2(m)
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A student stretches a string by 10mm, the string has a spring constant of 20N/m. Calculate the energy stored in the elastic potential energy store of the string.
0.5 x 20 x 0.01^2 = 0.001J
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What is the definition of specific heat capacity?
The energy needed to raise 1kg of a substance by 1oc
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What is the equation of specific heat capacity?
Change in thermal energy (J) = mass(kg) x specific heat capacity(J/kg0c x temperature change(oc)
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What is the equation linking kinetic energy, mass and velocity?
Kinetic energy(J) = 0.5 x mass(kg) x velocity^2(m/s^2)
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Power is defined by...
The rate of doing work
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What is power measured in...
Watts
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What is the equation linking power, work done and time
Power (W) = work done(J) / time(s)
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What is the conservation of energy?
Energy can be transferred usefully, stored or dissipated but can never be created or destroyed.
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For a falling object when there's no air resistance...
Energy lost from the GPE store = energy gained in the kinetic energy store
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Another equation for power...
Power(W) = Potential difference (V) x current (A)
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What is conduction?
Conduction is the process where vibrating particles transfer energy to neighbouring particles.
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Where does conduction usually occur in...
In solids
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What is convection?
Convection is where energetic particles move away from hotter to cooler regions.
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Where does convection usually takes place...
In solid and gases
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Radiators create convection currents by...
Creates convection currents in the air, energy is transferred from the radiator to the nearby particles by conduction. The air by the radiator becomes warmer and less dense. This warm air rises and is replaced by cooler air. The previous heated air transf
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What does lubrication do?
It reduces frictional forces
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What does insulation do?
It reduces the rate of energy transfer by heating.
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What will reduce the air resistance acting on a cyclist?
Wearing a more streamlined helmet.
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What is the equation for efficiency?
Efficiency = Useful energy output/Total energy input
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A 20kJ of energy is transferred to a mobile phone battery to fully charge it once it has lost all charge. It transfers 16kJ of useful energy during use until it needs to be recharged. Calculate the efficiency of the battery?
Efficiency = 16,000 / 20000 = 0.8 = 80%
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An electric motor has a useful power out of 57W and an efficiency of 75%. Calculate the total power input for the motor.
Efficiency = 0.75
Efficiency = useful / total
total = useful / efficiency
57/0.75 = 76W
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Other cards in this set

Card 2

Front

Give two energy stores that energy is transferred between when an apple falls from a tree

Back

Transferred from: GPE and kinetic energy
Transferred to: kinetic energy and thermal energy

Card 3

Front

What is the equation linking, elastic potential, spring constant and extension.

Back

Preview of the front of card 3

Card 4

Front

A student stretches a string by 10mm, the string has a spring constant of 20N/m. Calculate the energy stored in the elastic potential energy store of the string.

Back

Preview of the front of card 4

Card 5

Front

What is the definition of specific heat capacity?

Back

Preview of the front of card 5
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