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Acceleration due to free fall refers to the acceleration of an object that is near to the Earth, free-falling towards the ground. This acceleration is constant and approximately 10 m/s².

Define speed, velocity, acceleration, uniform acceleration

8787 admin

30/10/2023 at 9:05 pm (last edited 30/10/2023 at 9:06 pm)

Speed is the change in distance per unit time.

Velocity is the change in displacement per unit time.

Acceleration is the change in velocity per unit time.

Uniform acceleration refers to a uniform change in velocity over time.

What is a thermistor?

8783 admin

30/10/2023 at 5:43 pm (last edited 30/10/2023 at 5:43 pm)

A thermistor is a type of transducer which responds to a change in temperature. Its resistance decreases when temperature increases, and vice versa.

State the properties of magnets

8777 admin

30/10/2023 at 5:37 pm (last edited 30/10/2023 at 5:37 pm)

When a magnet is suspended freely, it will come to rest in a North-South orientation.
Unlike poles attract.
Like poles repel.
A magnet is strongest at its poles.

Define Faraday’s Law of Electromagnetic Induction

8770 admin

30/10/2023 at 5:22 pm (last edited 30/10/2023 at 5:22 pm)

Faraday’s Law of Electromagnetic Induction states that the electromotive force induced in a conductor is proportional to the rate of change of magnetic flux linkages through the conductor.

(Memorise it! It is useful when trying to explain the effects caused by Faraday’s Law)

Define Lenz’s Law

8767 admin

30/10/2023 at 5:13 pm (last edited 30/10/2023 at 5:13 pm)

Lenz’s Law states that the direction of the induced e.m.f. and hence the induced current in a closed circuit, is always such that its magnetic effect opposes the motion or change producing the induced e.m.f.

(Memorise it! It is useful when trying to explain the effects caused by Lenz’s Law)