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P3 Revision ­ Turning Forces

Give the equation for moments

Moments = Force x Perpendicular Distance from the pivot to the line of action

Describe the centre of mass

The centre of mass is the point where an object's mass is concentrated

Define the Principle of Moments

The Principle of…

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The planet will travel more slowly around the sun
The planet will take longer to make a compete orbit

Explain the difference between geostationary and polar orbits

Geostationary orbits:

Remain in the same place above the Earth's surface using an orbit of 24 hours above
the equator and are used…

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Cameras use a converging lens to produce a real image whereas magnifying glasses use a
converging lens to produce a virtual image

Describe a sound wave

A sound wave is caused by mechanical vibrations and travels as a wave

Explain the differences and similarities between light and sound

Differences:

Light…

Page 4

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Reverse the direction of the magnetic field

Explain the importance of the motor effect in a motor

When a current passes through the coil, a force acts on each side of the coil so the
coil spins due to the motor effect.
This force on each side of the coil…

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When an alternating current passes through the primary coil, an alternating magnetic
field is produced which continually expands and contracts.
The alternating magnetic field lines pass through the secondary coil and induce an
alternating potential difference across its ends as well as a current if there is a
compete current.…

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Describe the life cycle of a star

Clouds of dust and gas gather by gravitational attraction, merging to become
increasingly dense and form a protostar.
As a protostar becomes denser, it gets hotter until the nuclei of hydrogen atoms
and other light elements fuse together. Energy is released during the…

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Radio telescopes have been used to look for signals from space to indicate existence
of living beings with advanced technologies.

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