| A | B |
|---|
| Displacement | Net distance from origin in a given direction - a vector |
| velocity | rate of change of displacement - a vector |
| speed | Rate of change of distance covered - a scalar |
| distance | Scalar legnth of path covered |
| acceleration | rate of change of velocity - a vector |
| instantaneous velocity | vlocity at an instant - determined from slope of a graph rather than distance divided by time |
| average velocity | Distance divided by time over a finite time interval |
| slope of a graph | Rise over run v on an s-t graph |
| area under a graph | Between the line and the origin - e.g. change in s on a v-t graph |
| equations of motion | suvat linking equations |
| free fall | motion changed by gravity alone - note things can fall while going up |
| terminal velocity | for a falling object |
| Force | Can change the velocity of an object or change the shape of an object |
| spring constant | Force required to produce a unit extension in an elastic object |
| extension | net change in length due to an applied force |
| vector | value with a stated direction |
| resolve | take a vector and split it into 2 usually perpendicular components |
| component | Part of a vector in a given direction - can be combined with a perpendicular component to remake the original vector |
| free-body diagram | Diagram with vectors showng size |
| tension | Force a string produces as a result of being pulled |
| friction | force parallel to surface that can oppose motion |
| upthrust | Force caused by displacement of a fluid |
| lift | force caused by moving through a fluid |
| normal force | Force perpendicular to a surface |
| first law | an object remains at rest or continues to move in a straight line unless acted on by a force |
| second law | F=ma |
| third law | Every action has an equal and opposite reaction |
| equilibrium | net force (and maybe truning force) = zero - no acceleration/change in velocity |
| inertia | Propoerty of an object to oppose change in motion - equal to mass |
| reaction | Force as a result of an action |
| weight | Force due to gravity on an object |
| momentum | mass x velocity |
| impulse | Force x time (or the area under a force time graph). It's equal to the change in momentum |
| conservation | It's the same before and after |
| elastic | Interaction where kinetic energy is conserved |
| inelastic | Interaction where kinetic energy is conserved |
| work | Force x distance |
| energy | Ability to do something - the main idea in physics |
| kinetic | Related to motion |
| gravitational potential | Energy due to mass and position |
| elastic potential | Energy stored in a stretched object |
| efficiency | Ratio out over in |
| power | Rate of doing work |
| centripetal | Force towards the centerof a circle |
