physics - ch 31 - speed displacement, velocity and acceleration

Whats speed

how quickly an object can move from one place to anothe

How do we calculate speed

speed = distance/time

what is displacement

distance in a given direction/ shortest distance between two points in a given direction and independent of the pathway taken

what is velocity

velocity is speed ina given direction

How does one calculate velocity

change in displacement / time taken

what does slope tell you in a distance time graph

tells you the speed !

what is the acceleration of an object

Acceleration is the change in velcoity in one second , accelerate in science means to speed up or slow down

how does one calculate acceleration

change in velocity / time taken

whats the unit of acceleration

ms^-2 or m/s/s

what does the slope in a velocity time graph tell is

the acceleration

how does gravity effect acceleration

on earth, a falling bodyt qill accelerate at a rate of 10 ms^-2 every second, in reality a falling body might not accelerate at thisrate due to air resistance. (eg stone will fall faster than a feather unless dropped in a vacuum.