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Physics 2

Distance, speed and acceleration. Physics 2. Chapter 15. GCSE Additional Science. Distance, speed and acceleration. Speed = distance (metres) time (seconds). S. V × t. Click here for the answers. Aled walks 200m in 40s. What is his speed?

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Physics 2

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  1. Distance, speed and acceleration Physics 2 Chapter 15 GCSE Additional Science

  2. Distance, speed and acceleration Speed = distance (metres) time (seconds) S V × t Click here for the answers • Aled walks 200m in 40s. What is his speed? • Lowri travels 2km in 1000s. What is her speed? • How long would it take for Dafydd to run 100m if he runs at a speed of 10m/s? • Heledd travels at a speed of 50m/s for 20s. How far does she travel? • A car travels at a speed of 85 mph (about 40m/s). How long would it take for him to travel 20km? 1) 5m/s 2) 2m/s 3) 10s 4) 1000m/s 5) 500s Chapter 15 GCSE Additional Science

  3. Distance-Time Graphs 4) Straight line at a downwards angle = • 2) Straight horizontal line = 3) Straight line at a greater angle upwards = • Straight line at an upwards angle = 40 30 20 10 0 Motionless Constant speed in reverse Distance (metres) Chapter 15 GCSE Additional Science Time/s 20 40 60 80 100 Constant speed forwards (high) Constant speed forwards (low)

  4. 40 30 20 10 0 Distance (m) Time (s) 20 40 60 80 100 Chapter 15 Click here for the answers GCSE Additional Science • What is the speed during the first 20s? • How far is the object from the start after 60 seconds? • What is the speed during the last 40s? • When was the object travelling at its fastest? 1) 0.5m/s 2) 40m 3) 2m/s in reverse 4) 40 – 60s

  5. Speed v Velocity This car’s speed is 20m/s Speed of 20m/s to the right Simply, speed is the distance travelled per second … Velocity is the distance travelled per second in a specific direction ….. Chapter 15 GCSE Additional Science

  6. Acceleration change in velocity (m/s) acceleration (m/s2) = time (s) V - U a×t • A biker speeds up from 0 to 10m/s in 5 s. What is the acceleration? • A ball is dropped with an acceleration of 10m/s2 for 12s. By how much will the velocity of the ball change? • A car speeds up from 10 to 20m/s with an acceleration of 2m/s2. How much time did this change take? • A rocket speeds up from 1 000m/s to 5 000m/s in 2s. What is its velocity? Click here for the answers Chapter 15 1) 2m/s2 2) 120m/s 3) 5s 4) 2000m/s2 GCSE Additional Science

  7. Velocity-Time Graphs • Line at an upwards angle = • 4) Line at a downwards angle = • 3) Line at an upwards angle = • 2) Horizontal line = 80 60 40 20 0 Constant acceleration Constant deceleration velocity (m/s) Chapter 15 GCSE Additional Science t(s) 10 20 30 40 50 Constant velocity Constant acceleration (lower)

  8. Calculating the Distance 80 60 40 20 0 Velocity (m/s) t/s Chapter 15 GCSE Additional Science 10 20 30 40 50 To calculate the total distance of the journey, you must calculate the area under the graph.

  9. 80 60 40 20 0 Velocity (m/s) t/s 10 20 30 40 50 Chapter 15 Click here for the answers • What is the velocity after 10s? • What is the acceleration between 20 a 30s? • What is the deceleration between 30 and 50s? • What was the distance of the journey? GCSE Additional Science 1) 40m/s 2) 2m/s2 3) 3m/s2 4) 1700m

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