Year 8 Physics Flashcards
What is the Geocentric model?
This means the Earth is at the centre of the Solar System and everything revolves around it.
What is the Heliocentric model?
This means the Sun is at the centre of the Solar System and everything revolves around it.
What disproved the Geocentric model?
Mars in retrograde discovered by Copernicus
What shape did Kepler prove that the planets moved in?
elliptical shape (oval)
What piece of equipment did Galileo use to get evidence about the Heliocentric Solar System?
Telescope
What happened to Galileo when he spoke about the Heliocentric Solar Sytem?
He was imprisoned for the rest of his life
What is the order of the planets starting with the closest to the Sun?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
What is the Sun?
The Sun is a star which is a large ball of hot gas. We see stars because we see the light they produce.
What is a planet?
A planet is a large ball of rock or gas that orbits a star. They do not produce light. We can only see them in the sky because they reflect the Sun’s light
What is an asteroid?
Asteroids are rocky or metallic objects of different shapes and sizes. They orbit the Sun and are found mostly within the asteroid belt between the orbits of Mars and Jupiter.
What is a comet?
Comets are lumps of ice and dust. They are of different shapes and sizes and they also orbit the Sun. When they come close to the Sun, the ice melts and evaporates and they develop a distinctive tail of gas and dust which streaks out behind it and is lit up by the Sun.
What orbits a planet?
A satellite (e.g. the moon) . They are held in place by gravity.
Give an example of a natural satellite
The Moon
Give 3 uses of artificial satellites
o Relaying television signals
o Communicating
o Astronomy (Photographing space)
o Photographing Earth
o Navigation
o Monitoring Earth’s weather
o Monitoring Earth’s atmosphere
o Search and Rescue
o Spying and security
What piece of equipment would you use to measure TIME? What units would you use to measure it?
Stop clock
Seconds (s)
What piece of equipment would you use to measure LENGTH? What units would you use to measure it?
Ruler
E.g. Centimeters (cm)
What piece of equipment would you use to measure TEMPERATURE? What units would you use to measure it?
Thermometer
Degrees Celsius (oC)
What piece of equipment would you use to measure MASS? What units would you use to measure it?
Balance / scales
grams (g)
What piece of equipment would you use to measure VOLUME OF LIQUID? What units would you use to measure it?
Measuring cylinder
mililitres (ml)
How many cm are there in 1m?
100cm
