Section+2

=__//**Section 2- Constant Speed and Acceleration: Measuring Motion**//__= toc

page 145 11/30/10

1a. the dots will be equally apart b. the dots will be further apart but equal distance between. c. the dots will be closer together but equal distance between. d. they will get further and further apart 6a.

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7a. If it was constant it would mark at a constant rate so the length would be the same. b. no because they are different lengths apart. 8a. b. The more segments the more speed. c. It got faster and faster because they segments are getting longer. 9a. 1,1,2,3,5,10 b. no, it wasn't constant. no, it wasn't constant. 10a. b. it will be the opposite bigger than smaller. c. 0,-2, 0,-4, -2 11a. The one where it speeds up is farther apart.

Physics Plus
page 152 12/02/10

1. a= (-.5m/s-.5m/s)/.01s a= -100m/s2 the negative means it's changing direction 100m/s=10 gs of acceleration g= acceleration to gravity 1g= gravity 4g= fast roller coaster 10g= fighter pilots 2. a(-.5m/s-.5m/s)/.2s a= -5m/s2 about half a g

Physics Talk
page 148 12/02/10

Average speed is the distance traveled divided by the time taken. The speedometer reading at any moment during your trip is your instantaneous speed. Acceleration is the change in speed divided by the time.

Checking Up
page 152 12/02/10

1a. Constant length in between b. The ticks get farther and farther apart c. The ticks get closer together 2. 8m/s 3. instantaneous is the speed at a given moment while average is the average of the speed during the whole time. 4. 10 km/h/s

Physics To Go
page 154 12/02/10

1. instantaneous is the speed at a given moment while average is the average of the speed during the whole time. 2a. 66.66 m/s b. 14 m/s c. 4.8 km/h d. 88.89 km/h 3a. none b. positive c. none d. negative e. none f. none 4a. A, D b. B c. A d. C e. a pos b none c pos then neg d pos 5. 1) 7 2) 21 3) 35 4) 49 5) 63 6) 77 7) 91 8) 105 9) 119 10) 133 11) 147 12) 162 6a. -5km/h/s b. negative 7a. constant b. accelerating c. constant, accelerating, decelerate, constant d. negative accelerating, constant, accelerating 8. 50 mph 9. no because that is only the final average not a speed at any given moment 10. . . . . . . . ....................... 11. 20 m/s 12. yes