Physics M

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Machine
A device in which a force applied at a point produces another force at another point.
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Magnetic pole
End of a bar magnet or a magnetic compass.
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Magnification
The image height ÷ the object height.
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Magnifying glass
A converging lens used to magnify a small object that must be placed between the lens and its focal point.
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Main sequence star
The main stage is the life of a star during which it radiates energy because of fusion of hydrogen nuclei in its core.
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Mass
The quantity of matter in an object; a measure of the difficulty of changing the motion of an object (in kg).
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Mass number
The number of protons plus neutrons in the nucleus of an atom.
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Maximise
Make as big as possible.
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Mechanical wave
Vibration that travels through a substance.
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Microwave
Part of the electromagnetic spectrum.
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Minimise
Make as small as possible.
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Moment
The turning effect of a force defined by the equation: Moment of a force (in newtonmetres) = force (in N) x perpendicular distance from the pivot to the line of action of the force (in m).
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Momentum
This equals mass (in kg) x velocity (in m/s). The unit of momentum is the kilogram metre per second (kg m/s).
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Motor effect
When a current is passed along a wire in a magnetic field and the wire is not parallel to the lines of the magnetic field, a force is exerted on the wire by the magnetic field.
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Other cards in this set

Card 2

Front

Magnetic pole

Back

End of a bar magnet or a magnetic compass.

Card 3

Front

Magnification

Back

Preview of the front of card 3

Card 4

Front

Magnifying glass

Back

Preview of the front of card 4

Card 5

Front

Main sequence star

Back

Preview of the front of card 5
View more cards

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