describing motion Flashcards
(23 cards)
Distance
how far object moves
does not involve direction
scalar quantity
Displacement
includes distance and direction
in straight line
starting to finishing point
vector quantity
Speed
just not involve direction
scalar quantity
measure of how fast
velocity
Involves direction
vector quantity
measure of how fast
speed distance time equation
distance (m)= speed x time
walking speed
1.5m/s
wind
5-7m/s
sound
330m/s
running
3m/s
cycling
6m/s
bus
14kmls/h
train
125mls/h
plane `
900km/h
speed
speed = distance /time
acceleration
Rate of change of velocity amount of velocity change per unit time
acceleration equation
acceleration (m/s^2) = change in velocity (m/s) / time (s)
velocity equation
change in vel = final vel - initial vel
uniform acceleration
acceleration due to gravity
roughly free fall at 9.8m/s
uniform equation
v^2-u^2=2as
distance time graph
if object moves in straight
distanced travelled plotted on distance time graphs
gradient equals speed of object= velocity
flat sections equals stationary
straight uphill equals study speed
distance time graph acceleration
If speed of object changes it will accelerate or decelerate
shown as curved lines on distant time graph
stiffening curve means object is speeding up
leveling off curve means object is slowing down
velocity time graphs
represents journey
how velocity changes
gradient = acceleration
flat section = steady speed
steep line = greater acceleration/ deceleration
straight line = constant acceleration/ deceleration
curved = changing acceleration/deceleration
calculating displacement
distance travelled in time interval
area under a velocity time graph
