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Physics definitons
physics
| Question | Answer |
|---|---|
| Density | Refers to how much matter is packed into a given volume |
| velocity | speed of an object in a particular time |
| acceleration | is the change in velocity over time |
| Deceleration | when velocity decreases |
| Force | Anything which causes an object to move or change velocity measured in Newtons |
| Friction | A force which prevents easy movement between two objects in contact. |
| Energy | Is the ability to do work unit is Joule (J) |
| Kinetic energy | Is the energy when something is in movement e.g. heat energy |
| Potential energy | Is energy that is stored e.g. nuclear energy |
| dissipated energy | energy that is not useful e.g. sound energy from a kettle |
| static electricity | generated when an object becomes charged. |
| Resistance | The opposition to the flow of electrons in a circuit and is measured in ohms |
| Ohms law | states that when the temperature is constant the amount of steady current passing through a material is directly proportional to the voltage across the material |
| Diodes | Electronical components that only allow current to flow through them in one direction. |
| Light emitting diode (LED) | a type of diode that lights up when current flows through it. |
| Resistors | Reduce the flow of current in a circuit |
| Light dependent resistors (LDRs) | are resistors that allows more current to flow through them when more light shines on them |
| thermistor | a type of resistor that allows more current to flow through them when more light shines on them |
| fuse | is used to break a circuit if too much electricity is flowing through it |
| universe | all of space and everything in it |
| star | is a large ball of gas that gives off light and heat |
| solar system | composed of a star and all the objects orbiting around it. |
| galaxy | is a collection of many billions of stars |
| Planet | large round object that travels around a star, clearing its own orbit |
| dwarf planet | round space object that travels around a star but has not cleared its own orbit |
| satellite | any object that orbits a planet |
| moon | naturally occurring satellite |
| asteroid | a small rocky object that orbits a star |
| comet | a small object composed from frozen gases, ice, rock and dust that can glow and produce a tail |
| gravity | force generated by all objects that attracts all other objects |
| Big Bang Theory | suggests that the universe started with an explosion that allowed all the universe's known matter and energy as well as space and time to form |
| Sun | Is the star at the centre of our solar system |
| Day and night | caused by the rotation of earth's on its own axis |
| Seasons | result from the tilt of the earth's axis |
| Lunar cycle | is the time it takes the moon to complete a full orbit of the earth |
| waxing moon | when the illuminated area of the moon is increasing |
| waning moon | when the illuminated area of the moon is decreasing |
| tides | are caused by the attractive forces of the gravitational pull of the sun and moon |
| solar eclipse | occurs when the moon blocks out the light of the sun from earth |
| lunar eclipse | occurs when earth casts a shadow on the surface of the moon |
| The international space station | is used to research the effects of space travel on the human body, to collect information about Earth and to test technologies for further space travel |
Created by:
Luc25