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module 1
kinematics
| Term | Definition |
|---|---|
| distance | how far an object has travelled |
| displacement | how far an object is and what direction it is from its starting point |
| uniform velocity/speed | when an object is travelling at a constant velocity/speed |
| NOT THE SAME | speed and velocity are |
| scalar | time (t) (s) |
| scalar | distance (s) (m) |
| vector | displacement (s) (m) |
| scalar | speed (v) (ms^-1) |
| vector | velocity (v) (ms^-1) |
| vector | acceleration (a) (ms^-2) |
| scalar | work (W) (joules) |
| scalar | power (P) (watts) |
| vector | momentum (p) (kgms^-1) |
| kgms^-1 | units of momentum |
| joules | units of work |
| watts | units of power |
| vector | impulse (p) (Ns/kgms^-1) |
| Ns or kgms^-1 | units of impulse |
| x vs t | displacement vs time graph |
| v vs t | velocity vs time graph |
| a vs t | acceleration vs time graph |
| velocity | x vs t gradient |
| acceleration | v vs t gradient |
| displacement | area under v vs t graph |
| horizontal lines | a vs t graphs will always be |
| object isn't moving | (x vs t) no slope means |
| uniform v and a = 0 | (x vs t) constant slope means |
| increasing v and a is + | (x vs t) increasing curved slope means |
| decreasing v and a is - | (x vs t) decreasing curved slope means |
| v is + | (x vs t) upward slope means |
| v is - | (x vs t) downward slope means |
| higher velocity | (x vs t) steeper slope means |
| a straight line | (v vs t) will always be |
| v is increasing and a is + | (v vs t) upward slope means |
| v is decreasing and a is - | (v vs t) downward slope means |
| uniform v and a = 0 | (v vs t) constant slope |
| v is + | (v vs t) when line is above x axis |
| v is - | (v vs t) when line is below x axis |
| vectorcosθ | x (horizontal) component of a vector is found by |
| vectorsinθ | y (verticle) component of a vector is found by |
| relative velocity | all motion is relative to a frame of reference (POV) |
| relative velocity | describes the velocity of an object with respect to a frame of reference |
| Va - Vb | velocity of a relative to b = |
| its velocity | anything relative to the earth is |
| its speed | the v of a boat relative to the water is |
| resultant vector of the boat and current | the v of the boat relative to the bank is the |
| river speed | doesn't affect time taken to cross |
| initial v of plane + v of wind | resultant velocity of plane in wind is |
| c^2 = a^2 + b^2 - 2abcosC | cosine rule |
Created by:
hoeshi
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