P3

Question 1

suvat equation without s

Answer 1

v = u + at

Question 2

suvat equation without u

Answer 2

s = vt - 0.5at2

Question 3

suvat equation without v

Answer 3

s = ut + 0.5at2

Question 4

suvat equation without a

Answer 4

s = t(v + u/2)

Question 5

suvat equation without t

Answer 5

v2 - u2 = 2as

Question 6

physics value for a

Answer 6

9.81

Question 7

only when can you use suvat

Answer 7

when a is constant

Question 8

thinking braking and stopping distance for
20, 30, 40, 50, 60, 70 mph UK high way code

Answer 8

6, 6, 12
9, 14, 23
12, 24, 36
15, 38, 53
18, 55, 73
21, 75, 96

Question 9

assumed reaction time by highway code

Answer 9

0.67s (includes seeing then reacting to a hazard)
or do 0.3 x speed in mph to get thinking distance in ms

Question 10

4 different methods to measure g

Answer 10

EM holds steel ball above trap door, timer triggered as circuit turns off, then ball drops and when it passes trap door timer circuit is broken so timer stops
Light gates
Camera on rapid fire picture mode, then analyse pictures
ticket tape timer - similar to camera but with repeated ink presses on a falling strip of papee

Question 11

what equation and graph used to determine g

Answer 11

s = ut + 0.5at2
as u = 0 then s = 0.5gt2
plot a straight line graph of s against 2 squared
gravity = 2 x gradient

Question 12

how to work out distance of a projectile

Answer 12

work out vertical component and how long it will take to vertically fall to 0, then times that time by horizontal component

Question 13

will accidentally dropping a ball at a slight angle change g value

Answer 13

barely - vertical and horizontal components are independent of each other