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Key Stage 3 Science

What does the term orbit mean? The path that a planet takes around a star, or the path that a moon or satellite takes around a planet.
What is a solar system? A star with planets and other objects orbiting around it.
What does Geocentric mean? A model of the solar system where the sun, moons and planets all orbit the earth
What does the term luminous mean and give 2 examples? Objects that emit light are luminous e.g bulbs and stars
Explain why day and night occurs The earth takes 24 hours to rotate on its axis. The part of the Earth which has sunlight falling on it is in daylight. The part without light, in shadow is in night time
Why does the Earth have seasons? How is the Earth leaning during the summer? The axis of the Earth being tilted. In summer, the Earth leans forwards towards the Sun and a higher intensity of Sunlight strikes..
What is a compass? A magnetised piece of metal that can swing around. One end always points north.
What is a magnetic field? The space around a magnet where it can affect magnetic materials or other magnets.
If the magnetic field lines are close together is it a weak or strong field? Strong
What types of poles attract? Opposite
Which materials are magnetic? iron, steel cobalt and nickel
Describe how a planet moves? It moves in an elliptical orbit around a star
What does heliocentric mean? A model of the solar centre that has all the planets orbiting the Sun at the centre
What does the term non-luminous mean? Gibe 2 examples of non-luminous objects Non luminous objects do not produce light. We see non-luminous objects as they reflect light e.g moons and planets
What is a star? A huge ball of gas that gives out energy – we see some of the energy as light.
What do field lines show? Lines drawn to show which way a magnetic field acts.
What is the value of the Earth’s gravitational field? 10N/kg
Explain the term weight? What unit is it measured in? The amount of force with which gravity pulls things. It is measured in newtons (N).
What is the equation for calculating weight in words? Weight = mass x gravitational field strength
What would happen to your mass and weight on the moon? Mass would be the same, weight would be less than on Earth
Explain what a satellite is? Anything that orbits a planet or a moon.
Explain what a galaxy is? Millions of stars grouped together.
What is the order of the planets from the Sun? Mercury, Venus Earth, Mars, Jupiter, Saturn, Uranus and Neptune
Draw a bar magnet and draw the pattern of the magnetic field lines around it.
Define "mass" The amount of matter an object contains
Define "weight" The force of gravity on an object
State the value of gravitational field strength on Earth 9.8 N/kg
State the equation for weight Weight = mass x gravitational field strength
Define "light year" Define "galaxy"
The distance travelled by light in one year A collection of stars
Name the main components of the Solar System Sun, planets, moons, asteroid belt, dwarf planets
Recall the order of the 8 planets in the Solar System Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
What is a year? The time taken for a planet to orbit the Sun
What causes day and night? The Earth spinning on its axis
What causes the seasons? The tilt of the Earth
List the following from smallest to biggest: solar systems, moons, stars, planets, universe, galaxies, universe moon, planet, star, solar system, galaxy, universe
Name the galaxy that we are in The Milky Way
Define "star" An object in space that gives out light and heat energy
Name the force that keeps planets and moons in orbit around larger objects Gravity
Define "natural satellite" A moon that orbits a planet
Define "artificial satellite" Manmade objects that orbit Earth; used for communications
Name four methods used to investigate space Earth-based telescopes, space-based telescopes, unmanned probes, manned missions
State the standard unit of mass Kilograms (kg)
State the standard unit of weight Newton (N)
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