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yr7 science revision

semester 2 topics

newtons the unit that force is measured in
balanced forces two forces acting on an object that cancel each other out
gravity A force that pushes objects downward
contact forces a force that needs to be in contact with something
friction a contact force that slows the movements of objects
spring balance the equipment used to measure the newtons of a force
weight is mass x gravity
mass the amount of matter that is in an object
spring tide the tide after a new or full moon when there is the difference between high and low water
Earths rotation the rotation of earth around its own axis.
probe a piece of equipment sent out in space to explore planets
telescope a piece of equipment based in space or on land that magnifies objects at a great distance.
buoyancy A force that acts in water and pushes objects upward
solar eclipse an eclipse when the moon is in the middle of the sun and earth.
static electricity the build up of positive and negative charges on two difference surfaces.
heliocentric model the model of the solar systems that demonstrates the sun in the middle
Geocentric model the model of the solar system that shows the earth in the middle
planet order Mercury, venues, earth, mars, Jupiter, Saturn , Uranus, Neptune, Pluto
mitochondria an organelle in plant and animal cells
cell wall a layer of polysaccharides lying outside the plasma membrane
microscope a piece of equipment magnifies small objects
Created by: jroberts.12



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