The moment of a force is the turning effect of a force, and is obtained by the product of the force and the perpendicular distance from the line of action of the force to the pivot.
Category: Pure Physics
Define density
Density is the mass per unit volume of a substance.
Define gravitational field strength
Gravitational field strength is the gravitational force per unit mass (N/kg).
Define gravitational field
Gravitational field is a region in which a mass experiences a force due to gravitational attraction.
Define mass
Mass is the measurement of the amount of substance in a body.
Define acceleration due to free fall
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
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?
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
- 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
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)