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Physics Semester 1
| Term | Definition |
|---|---|
| Science | Knowledge |
| Physics | Nature |
| Scientific Theory | An explanation of a natural phenomenom that agrees with all known evidence |
| Experiment disagrees with prediction made by theory | Flaw in the experiement or theory is wrong |
| Units of measure | Standards used to make measurements of physical quantities |
| Physical quantities | A matter that can be measured |
| Velocity | A measure of how quickly position changes |
| Acceleration | A measure of how quickly velocity changes |
| Calculate distance | x=vt |
| Calculate speed | v-u=vt |
| Horizontal component | vcos(0) |
| Vertical component | vsin(0) |
| 1st law of motion | Unbalanced forces cause acceleration. When in equilibrium the object is in constant velocity or rest |
| 2nd law of motion | F=ma. Mass resists acceleration |
| 3rd law of motion | When two objects interact they exert equal magnitude of force in the opposite directions |
| Equilibrium | Balance between opposing forces, zero acceleration |
| Object in equilibrium | Rest or constant velocity |
| SI unit of force | Newton |
| SI unit of weight | Newton |
| SI unit of mass | kilogram |
| Def of mass | Amount of material in an object |
| Def of weight | Measure of gravitational force acting upon it |
| Momemtum (p) | How difficult it is to stop an object, kgm/s |
| Conservation of momemtum | No external forces acting on the system, p=p' |
| Conservation of energy | No dissipative forces acting on the system |
| Impulse (J) | Change in momemtum, Ns |
| Work done | Force is applied over displacement, work is positive |
| Kinetic Energy | Energy an object has due to motion, needs speed for calculation |
| Potential Energy | Energy an object has due to position, needs height for calculation |
| Mechanical Energy | Energy an object has due to motion and position, sum of potential and kinetic |
| Internal Energy | Energy that results in its temperature |
| Electrical Energy | Energy supplied by electrical current |
| Chemical Energy | Energy released/absorbed by chemical reaction |
| Nuclear Energy | Energy released by nuclear reaction |
Created by:
rubee
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