Unit 2 0.0 / 5 ? PhysicsForces and MotionElectricityEnergyGCSEAQA Created by: tyrawickhamCreated on: 10-04-15 19:00 If something has velocity, it has both… speed and direction 1 of 21 Speed and velocity are both measured in… m/s (or km/h or mph) 2 of 21 What is speed? how fast you're going (e.g. 30mph or 30 m/s) no regard to direction 3 of 21 What is velocity? How fast you're going with the direction specified (e.g. 30 mph north) 4 of 21 What does the gradient of a distance time graph tell you? How fast your object is travelling. The gradient is the change in distance (vertical axis) divided by change in time (horizontal axis) 5 of 21 Gradient = … speed 6 of 21 What are the flat sections? Where it is stationary 7 of 21 Straight uphill or downhill means… it's travelling at a steady speed 8 of 21 The steeper the graph the… faster it is going 9 of 21 Downhill section means… It's going back towards it's starting point 10 of 21 Curves represent… Acceleration or deceleration 11 of 21 A steeping curve means… Its speeding up (increasing gradient) 12 of 21 A levelling of curve means… It's slowing down ( decreasing gradient) 13 of 21 How do you work out the speed from a distance-time graph? Vertical (divided by) horizontal 14 of 21 What is acceleration? How quickly the velocity is changing 15 of 21 Change in velocity in acceleration can be… Change in speed or change in direction or both 16 of 21 Acceleration formula Change in velocity (divided by) time taken 17 of 21 Acceleration triangle (v-u)/ a x t v= final velocity u= Initial velocity 18 of 21 Unit for acceleration… m/s (small 2) 19 of 21 In a velocity time graph, the gradient equals… acceleration 20 of 21 Flat sections represent… steady speed 21 of 21
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