motion - yr9

Question 1

speed

Answer 1

how far an object can move in a certain time

scalar

Question 2

speed or velocity equation

Answer 2

v = d/t

Question 3

distance time graph

Answer 3

straight diagonal line = steady speed
curve = accelerate/ decelerate
flat line = stationary
negative gradient = travelling in reverse direction

Question 4

acceleration

Answer 4

how much velocity changes over time in m/s^2
A vehicle’s capacity to gain speed

Question 5

acceleration equation

Answer 5

a = change in v/ change in t
a = (v-u)/t

Question 6

velocity time graph

Answer 6

diagonal up/down line = constant acceleration/ deceleration
horizontal line = constant speed
gradient = acceleration
area under graph = distance

Question 7

stopping distance

Answer 7

minimum distance car can safely stop in

thinking + braking distance

Question 8

thinking distance

Answer 8

distance travelled by vehicle in time it takes for the driver to react
affected by alcohol, tiredness, distraction, soeed

Question 9

braking distance

Answer 9

distance travelled by vehicle in time it takes for the braking force to act
affected by speed and conditions that reduce FRICTION e.go rain, conditions of tires/brakes/road

Question 10

weight equation

Answer 10

mass x gravitational field strength

w(N) = m(kg) x g(N/kg)

Question 11

KE

Answer 11

1/2 m v^2
double m = double KE
doubke v = 4 times KE