What phrase describes a contrary relationship between two variables such that they move in opposite directions? (Negative correlation)
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Card 7
Front
How does a diagram showing the weekly position of a comet show the change in speed each week?
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Card 8
Front
Suggest why the speed of a comet changes depending where it is
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Card 9
Front
Explains what happens to a light ray when it enters a glass block and total internal reflection occurs.
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Card 10
Front
Explain why the quantity called refractive index has no unit.
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Card 11
Front
Explain the purpose of the brushes and the commutator in a d.c. motor.
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Card 12
Front
State what happens to the motor when both the magnetic field and the current are reversed.
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Card 13
Front
State the relationship between kinetic energy (KE), mass and velocity.
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Card 14
Front
A driver applies the brakes to stop a train.State what happens to the kinetic energy of the train.
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Card 15
Front
The passengers who use a station are carried from platform level to street level in a lift. Explain why these passengers gain gravitational potential energy in the lift, even when they are below ground.
