Motion

Question 1

Displacement

Answer 1

Distance from a particular point

Question 2

Velocity

Answer 2

Speed in a particular direction

Question 3

Speed equation

Answer 3

s = vt

v = s/t

Question 4

Acceleration

Answer 4

Rate of change of velocity with respect to time

When caused by gravity, referred to as g = 9.81ms^-2

Question 5

Iterative models

Answer 5

Step by step model, usually with respect to time, input previous outputs to create a track of how a variable progresses

Question 6

Pros and cons of iterative models

Answer 6

Pros: If friction acts on an object, a is not constant but decreases as v increases. This is hard to model with calculus but can be easily adjusted for in an iterative model; ( a = g - k v^2 )

Cons: The model jumps between time intervals , which is inaccurate, however this can largely be tackled by using smaller time intervals

Question 7

Graphical Models

Answer 7

Using vector addition can make graphs look clearer rather than going in jumps
Works for falling objects initially going horizontal because the initial vectors are not going in the same plane

Question 8

SUVAT

Answer 8

v = u + at
s = ut + 0.5at^2
s = vt - 0.5at^2
v^2 = u^2 + 2as
s = 0.5(u+v)t

Question 9

Braking distance

Answer 9

At 30mph / 13.4ms^-1
9m-14m

At 60mph / 26.6ms^-1
18m-55m