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science revision
yearly exam
| Term | Definition |
|---|---|
| newtons | the unit that is used to measure force |
| balanced forces | balanced forces are two forces that cancel each other out |
| gravity | a force that pulls things to the center of the earth |
| contact forces | A force that only happens by physical touch |
| friction | Friction is the process in which the force resits the motion |
| spring balance | a technology used to measure forces |
| weight | weight changes if you go to a different planet as the gravity is different |
| mass | mass never changes the weight plus the gravity equals the mass |
| Earths rotation | the Earth rotates around on its axis it rotates for 24hours then starts again |
| probe | the technology that helps us study the world around us there are three types of probes landing probes, orbiting probes and Interplanetary probes |
| telescope | a technology that makes things far away seem closer there are two types of telescopes land telescopes and the ones they put in space |
| eclipses | eclipse means in shadow |
| solar eclipse | when the moon's shadow blokes the sun |
| static electricity | imbalance of electric charges |
| heliocentric | the Sun centered model is called heliocentric |
| geocentric | geocentric means Earth centered which is the old model |
| planet order | mercury, Venus, Earth, Mar, Jupiter, Saturn, Uranus, Neptune and Pluto. |
| buoyancy | A force that makes things float in water |
| mitochondria | this is part of the cell keeping the cell alive by giving it the nutrients it needs and helping it breathe |
| cell wall | a cell wall is on a plant cell it helps keep the plant standing as they don't have a spine like animal and human |
| microscopes | the object we use to study cells and bacteria |