Forces and motion: Motion Flashcards
what equation is used to calculate average speed?
speed=distance/time
speed= gradient of the line of a distance time graph
On a distance, time graph, what axis is the distance plotted on?
y-axis
On a distance, time graph, what axis is the time plotted on?
x-axis
for a graph of unknown function, how do you determine the instantaneous speed?
the straight line tangent of the curve is drawn at the point in time and the gradient of the tangent is the instantaneous speed.
the steeper the tangent of a distance time graph, the greater the……
speed
what is the equation of average velocity
average velocity = change in displacement / time taken
On a displacement, time graph, what axis is the time plotted on?
x-axis
On a displacement, time graph, what axis is the displacement plotted on?
y-axis
is the gradient of a displacement time graph is negative, what is unique about the velocity?
the velocity is in the opposite direction to the defined positive direction
for a displacement time graph of unknown function, how do you determine the instantaneous velocity?
draw a tangent and work out the straight line velocity at that point.
What is acceleration defined as?
acceleration = change in velocity/time
how do you determine the acceleration on a velocity time graph?
gradient of the graph at a point t
what does the area under a velocity time graph denote
total displacement of the object
in suvat, determine the 5 terms
s
u
v
a
t
s=displacement
u=initial velocity
v=final velocity
a=acceleration
t=time taken
What are the 5 equations of motion
v=u+ at
s=ut+ 1/2at^2
s=vt-1/2at^2
s=1/2(u+v)t
v^2=u^2 + 2as
equation for thinking distance
thinking distance = speed x reaction time
define thinking distance
thinking distance is the distance travelled betwen the moment you see a reason to stop to the moment when the brake is first applied
define braking distance
the distance travelled from the time the brake is applied to when the vehicle is at a stand still
what factors can affect thinking distance
tiredness
intoxication
speed of vehicle
…
what factors can effect breaking distance
road surface
condition of brakes
condition of tyres
speed of the vehicle
…
the higher the speed of a vehicle, the higher the…..
braking distance and thinking distance
state the value of g on earth
9.81 ms^-2
describe some types of methods used to determine g
electromagnet and trapdoor
light gates
strobe taking pictures
When determining g, what 2 axis should you plot? and what value does the gradient equal
displacement (s) against time^2 (t^2).
g/2 = gradient
in projectile motion, does the horizonal component of velocity remains constant?
Yes, the horizonal component remains constant
