physics chapter 2 kinematics

Speed and velocity

** must know definition of speed+velocity

Example question

Example question

** remember displacement can be negative (when go opp dircetion)

** have to state both magnitude + direction

** must state statement

eg, take the direction right as positive (can also use cardinal direction)

• if we state dircetion we can drop the -ve

Representing direction

** can also state to the left/right

** taking the direction right as positive

Acceleration

a = v-u/t

uniform acceleration

** must memorise definition of uniform acceleration

Example question

Non-uniform acceleration

Distance-time graphs

Distance-time graph of motion

Gradient of dist time graph —> speed

gentle —> steep ( increasing speed)

steep—> steep (decreasing speed)

speed-time graph

increasing speed = acceleration

decreasing speed = deceleration

constant speed, acceleration = 0

Gradient of speed-time graph = acceleration

gentle to steep —> increasing acceleration/ deceleration

steep to gentle —> decreasing acceleration/deceleration

** must state both speed and accleration

Area under speed-time graph

** distance= area under speed-time graph (must write this)

acceleration of freefall (5)

acceleration of freefall

reminders

** remember displacement can be negative (when go opp dircetion)

** have to state both magnitude + direction

** must state statement

eg, take the direction right as positive (can also use cardinal direction)

• if we state direction, we can drop the -ve

1. use ruler to split parts

2. describing motion of speed-time graph→ must state bothe speed + acceleration

3. s^-1 → per second

4. acceleration =-2 → deacceleration = 2

5. acceleration of freefall can work both upwards and downwards