Density formula
Density = Mass divided by volume
What is the formula for specific heat capacity
C(j/kg) = Q(energy added/removed) / ((m) mass in kg x change in temp)
Q: Why does stretching, bending or compressing an object require more than one force?
A: Because forces must act in opposite directions on the object.
Q: What is elastic distortion?
A: A change in shape that is reversible when the force is removed.
Q: What is inelastic distortion?
A: A change in shape that is not reversible when the force is removed.
Q: What is the equation for linear elastic distortion?
A: Force = spring constant × extension
Q: What is the equation for energy transferred in stretching a spring?
A: Energy transferred = 0.5 × spring constant × (extension)²
Q: What is investigated in the core practical on springs?
A: The extension and work done when applying forces to a spring.
Q: Why does atmospheric pressure vary with height above the Earth’s surface?
A: Because the density of air decreases with height.
Q: What is pressure in a fluid due to?
A: The fluid and atmospheric pressure.
Q: What is the equation for pressure?
A: Pressure(pascals, Pa) = force ÷ area
Q: Why does pressure in liquids vary with density and depth?
A: Because of the weight of the liquid above.
Q: What is the equation for pressure in a liquid?
A: Pressure = height × density × gravitational field strength
Q: Why is an object in a fluid subject to an upwards force?
A: Because of pressure differences in the fluid.
Q: What determines whether an object floats or sinks?
A: Upthrust, weight and density of the fluid.
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Section 1 - Motion and Forces33
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Section 2 - Conservation of Energy12
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Section 3 - Waves and the Electromagnetic Spectrum25
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Section 4 - Radioactivity39
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Section 5 - Astronomy20
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Section 6 - Forces and Energy13
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Section 7 - Electricity and Circuits33
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Section 8 - Electric and Magnetic Fields31
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Section 9 - Matter15
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PPQs + Mark Scheme3
