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

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Presentation on theme: "Physics 2 Distance, speed and acceleration GCSE Additional Science Chapter 15."— Presentation transcript:

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

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

3 Distance-Time Graphs ) Straight line at a downwards angle = 3) Straight line at a greater angle upwards = 1)Straight line at an upwards angle = 2) Straight horizontal line = Distance (metres) Time/s Constant speed forwards (low) Motionless Constant speed forwards (high) Constant speed in reverse GCSE Additional Science Chapter 15

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

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

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

7 Velocity-Time Graphs velocity (m/s) t(s) 1)Line at an upwards angle = 2) Horizontal line = 3) Line at an upwards angle = 4) Line at a downwards angle = Constant velocity Constant acceleration Constant acceleration (lower) Constant deceleration GCSE Additional Science Chapter 15

8 To calculate the total distance of the journey, you must calculate the area under the graph Velocity (m/s) t/s Calculating the Distance GCSE Additional Science Chapter 15

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


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