Physics 11 Warren—NKEC

Name: ______________________________

Average Velocity 1. Usain Bolt clocked the 10 m splits shown below in his 2009 world record race in Berlin: Displacement [m, Forward]

Time [s]

0.0

0.00

10.0

1.89

20.0

2.88

30.0

3.78

40.0

4.64

50.0

5.47

60.0

6.29

70.0

7.10

80.0

7.92

90.0

8.75

100.0

9.58

a) Plot the displacement-time graph for his race.

Physics 11 Warren—NKEC

Name: ______________________________

b) Calculate Usian Bolt’s average velocity for this 100.0 m sprint.

c) Draw the secants from (0,0) to (5.47,50) and from (5.47,50) to (9.58,100). Calculate the average velocities represented by the two secants.

d) Compare Bolt’s performance during the first and the second half of the race.

e) Calculate Bolt’s average velocity for each 10 m interval of this race. Record your answers in the table below. Interval [m] 0.0 to 10.0 10.0 to 20.0 20.0 to 30.0 30.0 to 40.0 40.0 to 50.0 50.0 to 60.0 60.0 to 70.0 70.0 to 80.0 80.0 to 90.0 90.0 to 100.0

Displacement (Δd) [m]

Time elapsed [s] Δt

Average velocity [m/s]

Physics 11 Warren—NKEC

Name: ______________________________

2. A displacement-time graph for an insect flying in a straight line is shown on the right. a) Determine how long it takes to travel between 5.0 and 10.0 m.

b) Find how far it travels between 2.0 and 4.0 s.

c) Calculate the velocity at 3.0 s.

d) Convert the graph into a speed-time graph.

Physics 11 Warren—NKEC

Name: ______________________________

3. A car moves in a straight line according to the displacement-time graph below:

What was the car’s average velocity from 0 to 3 s?

3 to 5 s?

5 to 7 s?

7 to 9 s?

9 to 12 s?

0 to 12s?

Physics 11 Warren—NKEC

Name: ______________________________

4. The displacement-time graph below represents the motion of Mr. Warren in the aisle of Canning Value Foods.

Describe, qualitatively, the motion represented by the graph.