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yr 7 sci revision

semester 2 topics

newtons the unit of which force is measured in
balanced forces two forces acting in opposite directions on a object, and equal size
gravity a pulling force that helps us stay on the ground
contact forces any force that requires contact to occur eg. pushing, kicking etc
friction Friction is the resistance of motion when one object rubs against another
spring balance the tool to measure the weight of something
weight how much some weights
spring tide the large rise or fall of the tide at or soon after the new or full moon
earths rotation 24 hours
probe a spacecraft that collects information about other planets
telescope takes pictures of planets and stars
solar eclipse when the moon blocks the sun
static electricity occurs when there is a build up of electrons on something, giving it an electric charge.
buoyancy a force that acts in water and pushes objects upward.
heliocentric model the theory that the sun is in the middle of the universe/solar system
geocentric model the theory that the earth is in the middle of the universe/solar system
planet order Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
mitochondria the energy source in the plant cell
cell wall a strong, protective structure that surrounds a plant cell
microscope a device that magnifies tiny objects, or makes them look larger
non contact force when a force acts on an object without physically touching it.
Created by: rrandazzo.12