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science revision

semester 2 topics

TermDefinition
newtons the unit force is measured in
balanced forces two equal forces acting on an object that don't change the motion
gravity a non-contact force that pulls objects to the core of the universe
contact force the physical push or pull of an object
friction two objects trying to slide across each other in opposite directions causing the moving object to slow down.
spring balance the device used to measure weight in newtons
weight weight is dependent on the gravitational pull towards the center of the planet
solar eclipses when the sun and moon are in alignment from earth and the sun is in shadow.
mass the amount of matter that is in an object. It will always stay the same.
spring tide when the sun and moon are on the same side of earth causing a strong gravitational pull on the water on earth toward the moon
earths rotation Earth rotates on its axis causing day and night
probe designed and sent into space without any crew to explore various aspects of the solar system
static electricity negatively charged electrons when rubbed of on a positive surface, want to jump back to the negative surface because
telescope object designed to make distant objects look nearer and can collect data by taking photos
buoyancy a force that acts in water and pushes objects upwards.
heliocentric The current model of the universe that the sun is at the center and the planets, earth and moons all revolve around it.
geocentric The model of the universe that the earth is at the center and the planets, sun and moon all revolve around it.
planet order Mercury, Venus, earth, mars, Jupiter, Saturn, Uranus, Neptune, Pluto
mitochondria produces energy and is the 'power house' of the cell
cell wall a protective layer that is found on the outside of all plant cells
microscope a piece of equipment used to view very small objects up close.
Created by: bjohnson.12