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Motion graphs – Distance/time

Topic – Physics 2a. Motion graphs – Distance/time. Prior learning Calculating distance speed and time. Key words Journey, distance, speed, displacement, acceleration. Exercise 1. Worksheet – Distance time/displacement time. Exercise 2.

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Motion graphs – Distance/time

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  1. Topic – Physics 2a Motion graphs – Distance/time • Prior learning • Calculating distance speed and time. • Key words • Journey, distance, speed, displacement, acceleration

  2. Exercise 1 Worksheet – Distance time/displacement time

  3. Exercise 2 Exercise 1: You are at the beach looking for your friend. You walk West for 5 m in 20 s then see her. You both stop and chat for 40 s when, feeling hot, you both run 10 m West into the sea in 10s to stop and enjoy the cool water. 30 s later you hear another friend call you, he has ice creams for all so you both walk 20 m East in 20 s to enjoy your treat. Draw a distance/time graph and a displacement time graph for the above information. NOTE: Be careful, the axis will be different for each graph.

  4. Exercise 1

  5. Exercise 2 A From the graph, calculate the total distance travelled for the information above: B From the graph, calculate the displacement for the information above: C From the graph, calculate the speeds for each section on the Distance/time graph. D From the graph, calculate the velocity for each section on the Displacement/time graph

  6. Answers to exercise 2 A Dist = 35 m B s = -5 m west or 5 m east C A = 5  20 = 0.25 ms-1 B = 0 ms-1 C = 10  10 = 1 ms-1 D = 0 ms-1 E = 20  20 = 1 ms-1 D A = 5  20 = 0.25 ms-1 B = 0 ms-1 C = 10  10 = 1 ms-1 D = 0 ms-1 E = -20  20 = -1 ms-1 or 1 ms-1 East

  7. Extension • Distance/time or position/time • Read and make notes content and contexts page 68 • How do you work out gradient??

  8. Acceleration / time • In 2APHY we only deal with uniform acceleration so all acceleration/time graphs will look like the graph to the right which shows acceleration due to gravity in a frictionless situation. • Terminology: • upwards is positive, downwards is negative. • an unchanging velocity value is called a constant velocity; • an unchanging acceleration value is called a uniform acceleration.

  9. Exercise: Briefly describe the motion (qualitatively) for each of the following graphs each of which is the motion of a car

  10. tasks • Read page 71/72 • Draw fig 2.20 and explain in own words how this is calculated • Read over example 2.3b pg 70 to help • Read physics file and make notes • Copy summary 2.3 page 73 into notes

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