Physics 11

Name: ______________________________

Graphs of Wrath Answer Key Table 1. Relationship between velocity and time for three Hot Wheels cars

Time (s) 0 5 10 15 20 25 30 35 40 45 50

Car 1 Velocity (m/s) 0 6 12 16 23 30 34 40 46 55 62

Car 2 Velocity (m/s) 0 10 17 25 33 42 51 67 73 81 89

Car 3 Velocity (m/s) 0 3 7 11 14 19 22 25 30 34 39

Figure 1. Relationship between velocity and time for three Hot Wheels cars 100 90

y = 1.8164x - 1.0455

80

Velocity (m/s)

70

y = 1.2127x - 0.8636

Car 2

60

Car 1

50

Car 3 Linear (Car 2)

40

Linear (Car 1) 30

Linear (Car 3)

20 y = 0.7709x - 0.7273

10 0 0

10

20

30

40

50

60

Time (s)

1

Physics 11

Name: ______________________________

Questions 1. The slope of the line for car 1 is 1.82 m/s2. The slope of the line for car 2 is 1.21 m/s2. The slope of the line for car 3 is 0.77 m/s2. 2. a. The equation for the line for car 1 is: y = 1.82x – 1.05 b. y = (1.82m/s2)(90.s) – 1.05 m/s = 162.75 m/s = 163 m/s Discussion

1. Shown in blue is car 2’s decceleration due to really bad tires which heat up and get sticky. 2. Shown in green is the sudden stop of car 3 when it sees a moose in the road and jams on the brakes a 55 s.

2