MOTION GRAPHS Buttons Click here Clicking here will

MOTION GRAPHS Buttons Click here; Clicking here will allow toofhear some information on the Click here Click to seehere a list SIyou Clicking here again toof see amultipliers. list equations. Clicking here will reveal an answer. Clicking here will bring you back to this page. here will move you back astop page Clicking here will reveal some information. Clicking here will move you to the next page. topic. Clicking here again will sound. will. Clicking take you back to the page you onthe previously again will take you back towere the previous page. Topics Jump to… …Speed/Velocity Time graphs (two slides) Jump to… …Calculating Distance (HT) Jump to… …Distance – Time graphs (two slides) Jump to… …Stopping Distances Jump to… …Practice Quiz Jump to… …Past Paper Questions (six slides)

Speed – Time graphs Click to start. Click a specific part of the graph line for more information about it’s shape. Speed-time graphs show the motion of an object varies over a period of time. The key to understanding speedtime graphs is understanding their shape and gradient D B A C E F

Velocity – Time Graphs Click to start Click a specific part of the graph line for more information regarding it’s acceleration. We refer to velocity-time graphs when we wish to calculate the acceleration or deceleration of a vehicle. B A C D E F a = Δv t

Calculating Distance using a Velocity Time graph (HT) Click to Start In order to calculate distance travelled we need to calculate the area under the line of the graph. 15 10 Click here for a reminder on how to calculate the area of a triangle and rectangle. 5 Click a specific part of the graph line for a calculation showing the distance travelled 10 x 10 = 50 m 2 20 x 10 = 200 m 10 x 10 = 50 m 2

Distance - Time Graph A distance – time graph shows how the distance a vehicle moves from a starting point varies with time. Click here to see a visual representation of the graph. Cick to Start House (0 m) 1 st Lights (200 m) 2 nd Lights (400 m) Petrol Station (800 m)

Calculating Speed through using a Distance - Time graph Click to Start We can use data from a distance-time graph to calculate speed or mean speed of a vehicle. 400 m speed = distance time Click a button below for more information regarding the calculations. 800 m 200 s speed = distance time 20 s speed = 400 m 800 20 s mean speed = 20 m/s = 4 m/s

Stopping Distance The stopping distance of a vehicle is split into two separate distances. These are thinking distance and braking distance 20 mph 6 m 6 m 14 m 30 mph 9 m 24 m 40 mph 12 m 15 m 50 mph 18 m 60 mph 21 m 70 mph 20 mph x 2 40 mph + = Stopping distance Click a region of the graph for more information. 38 m 56 m 75 m 6 m 6 m x 4 x 2 12 m 24 m Worn tyres The following factors extend a drivers reaction time… Blank Cover 1 Icy Road Drugs …reduces friction. . “Ifthe thespeedisisdoubled doubed the thinking braking “If distance will increase by a They factorare of …and as a result increase also double. the thinking distance. four. ” proportional to each other. ” High mass Tiredness Alcohol Worn brakes

Practice Quiz Click the correct description for each graph. Constant Deceleration Constant Acceleration Non Constant Acceleration Constant Speed Constant Deceleration Constant Acceleration Constant Speed Stationary Non Constant Deceleration Constant Acceleration Stationary Constant Speed Non Constant Acceleration

Exam Question 1 WJEC Physics 2 June 2015 (Foundation) Q 1

Exam Question 1 5 s and 65 s

Exam Question 1 a = Δv t a = 400 10 10

Exam Question 2 WJEC Physics 2 Ionawr 2014 (Sylfaenol) C 6

Exam Question 2 0. 8 3. 2 a = Δv t a = 015 3. 2 “acceleration” is negative a = - 4. 69

Exam Question 2 The horizonal part of the graph would be longer (1) Due to an extended reaction time (1) The graph would be less steep (1) Due to the braking distance increasing and the car taking a longer time period to stop (1)

EQUATIONS er h hig r e igh h h r e h g i r e igh h Open the file “Maths for Physics” for more about the use of mathematics in Physics.

SI MULTIPLIERS p - pico k - kilo n - nano M - mega - micro G - giga m - milli T - tera You only see the letter of the prefix on an exam paper, NOT the name. On a Foundation paper only milli, kilo a mega are used.