Motion Flashcards
Define speed:
rate of change of distance
Average speed equation:
distance/time
SI base units for speed and velocity
ms^-1
What is instantaneous speed?
speed of an object over a very short time interval
Define velocity:
rate of change of displacement
Formula for velocity:
displacement/time
Define acceleration:
rate in change of velocity
Formula for acceleration:
(v-u)/t
What is a flat line on a displacement time graph?
stationary
What is a constant gradient on a displacement time graph?
constant velocity
What is a curved line on a displacement time graph?
acceleration
What is a flat line on a velocity time graph?
constant velocity
What is the gradient of a velocity time graph?
acceleration
What is the area under a velocity time graph?
distance
What is velocity at an object’s maximum height?
0
What practical is used when investigating terminal velocity?
dropping an object through a set of light gates
What practical is used when investigating the acceleration of freefall?
suspending a steel ball from electromagnets above a trapdoor
What is a projectile?
an object that is thrown at an angle to the horizontal, and therefore moves in both the horizontal and vertical planes
What trigonometry value is used for vertical motion?
sin(θ) x hypotenuse
What trigonometry value is used for horizontal motion?
cos(θ) x hypotenuse
What are the 5 rules for projectiles?
1) Break into V and H components
2) Choose direction of acceleration
3) Split page into V and H
4) Write out SUVAT
5) Direction in degrees to H and V
