motion Flashcards
what is displacement?
distance in a given direction. distance moved in a straight line from point a to point b in a specific direction.
what is speed?
change of distance per unit of time, how fast an object is moving?
what is velocity?
change of displacement per unit of time, speed in a given direction.
when speed is constant what does it mean for distance and time?
an object moving at a constant speed travels equal distances in equal time.
equation to calculate constant speed?
speed = distance/time
speed for an object moving at constant speed on a circle of radius R
v = 2 pi r / T
what are the 2 types of speed cameras
- measures speed as vehicle passes the camera
- linked to second speed camera and computer, which works out average speed of the vehicle between 2 cameras
average speed
average speed = s / t
instantaneous speed
instantaneous speed = change in s / change in t
what will graph of object moving at constant speed look like~?
straight line graph
what will graph of object moving at changing speed look like?
a curve
how to find gradient of a graph for an object with changing speed
draw a tangent at a point, and then measuring the gradient (change in y/change in x)
what is acceleration
change of velocity per unit time
if velocity is constant what is the acceleration
zero
what is uniform acceleration
velocity of an object moving along a straight line changes at a constant rate, acceleration is constant.
equation for acceleration
change in velocity / time ( v-u/t)
what is non uniform acceleration
direction of motion changes or speed changes at a varying rate,
on a velocity time graph what is the acceleration
acceleration at any point is the gradient of the tangent to the curve at that point (height/base) or (change in y/ change in x)
gradient of velocity time graph
acceleration
when can you use suvat equations
constant acceleration
what does suvat stand for
s - displacement
u - initial velocity
v - final velocity
a - accleration
t - time
what are the 4 forces on an inclined plane?
reaction force, weight, pull force and friction force
what is the speed for an object moving at a constant speed on a circle of radius?
v = 2πr/T
T- time to move round once
2πr - circumference of the circle
what is the equation for average speed?
distance/time
what does constant velocity mean?
An object moving at constant velocity moves at the same speed without changing its direction of motion
if an object changes its direction of motion or its speed or both - its velocity changes
how do you find displacement in velocity time graph?
displacement is represented on the graph by area under
