Movement and Position Flashcards
The……..of a distance time graph is the speed
Gradient
The Gradient of a velocity time graph is the…..
Acceleration
The area underneath a velocity time graph is the ……………
Distance traveled
On a distance time graph, what goes on the x axis
Time
How do you work out the speed in a distance time graph
100 ∆ = change in
( = -------)
3 = 33.3m/s
∆ Y
- - ------
∆ XHow do you work out the distance in a velocity time graph
Split the shape* into triangles and rectangles and work out the area of each of them.
Add them altogether.
(*The shape of the graph)
What is the equation to work out the acceleration
Change in velocity
Acceleration = —————————
____________ Time taken
v - u a = ----------u = the initial velocity of the object
t\_\_\_\_\_ v = the final velocity of the object
What are the units of acceleration
m/s²
Calculate the acceleration of a train that moves from rest to 20m/s in 80 seconds
u = 0 v = 20 20 - 0 a = a= --------- = 0.25 m/s² t = 80 80
What other equation also tells you about acceleration
And what does the s equal
final speed² = initial speed² + (2 x acceleration x distance moved)
v² = u² + 2as
s = distance moved
How would you rearrange the equation of v² = u² + 2as to find the acceleration
v² = u² + 2as
(- u² )
v² - u² = 2as
(÷ 2s)
= v² - u²
————
2s
What is the equation to work out the stopping distance
Stopping distance = thinking distance + braking distance
What does the thinking distance depend on
Your reaction time. Increased if alcohol, tiredness.
MOBILE PHONE DOES NOT AFFECT IT!
The speed of the car, the further you travel whilst you are moving.
