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Motion graphs – Distance/time

Learn how to calculate distance, speed, and time using motion graphs. Practice exercises help understand concepts of journey, displacement, and acceleration. Calculate total distance, displacement, speeds, and velocities from graphs. Explore key terminologies and how to work out gradients.

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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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