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Yr 7 Sci Revision

semester 2 topics

newtons units used to measure force
balanced forces Balanced forces are two forces acting in opposite directions on an object
gravity the force that attracts a body towards the center of the earth
contact forces Contact forces are forces that act between two objects that are physically touching each other.
friction the resistance that one surface or object encounters when moving over another.
spring balance a balance that measures weight by the tension of a spring
weight a body's relative mass or the quantity of matter contained by it
spring tide a tide just after a new or full moon, when there is the greatest difference between high and low water
Earths rotation Earth rotates once in about 24 hours with respect to the Sun
Probe an unmanned exploratory spacecraft designed to transmit information about its environment.
telescope an instrument used to see things at a long distance
buoyancy the ability or tendency of something to float in water or other fluid
solar eclipse an eclipse in which the sun is obscured by the moon
static electricity a stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.
Heliocentric model Heliocentric model is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System.
Geocentric model a geocentric model is the model of planets where the earth is in the middle
planet order Mercury, Venus, earth, mars, Jupiter, Saturn, Uranus, Neptune
mitochondria it is an organelle found in most cells
cell wall a layer of polysaccharides on the outside of cells
microscope a tool used to see small objects or organisms
Created by: wrong



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