Chapter+2,+Section+2

What do you think: What we mean is that the ball is traveling 100mph in relation to the batter or the pitcher, which are staying still. The ball, when moving, starts off at the 100mph, but then as it reaches the plate, it has lost some of its velocity as it came into contact with wind resistance (caused by the ball moving 100mph through the air) and gravity dragging the ball downward.

Distance/time

100 miles (distance)/ hour (time) 45 meters (distance)/ second (time)

Steps to find Vel.

1. measure distance between two points

2. convert to meters

3. Divide by Gap

A= Vf-Vi/ (triangle) Time

Investigation:

2. A. The dots will be evenly spaced

B. The dots will be more spaced out, still even.

C. The dots will be closer together, but evenly spaced.

D. The dots will start evenly spaced, then become more spread apart and more unevenly spaced.

6.

7. A. The tape was not moving at a constant velocity, it was accelerating little by little.The tape can be constant, but it can also not look so because the tape could be cut at different points, uneven compared to the rest, and have slack between the last point and the end of the tape segment.

B. The speed was not constant.

8.



B. The length of the segments shows that the walker is accelerating from a slow speed because the strips are getting longer.

C. The segments are slowly becoming longer and longer as you go farther down the paper.

9. A. 1. 1.2 cm 2. 1.6 cm 3. 2.5 cm

B. No he didn't move at a constant velocity because the difference between the first two differences was .4, while the second and third segments was .9

10.



B. I would expect the pattern to be similar to the first graph we made because it is slowing down in comparison to the second graph.

C. No, the walker did not move at a constant velocity because it started off fast, then quickly slowed down, then slowed down at a different velocity.

11.

A. The tape first moves at a fast positive acceleration, then starts to move at a negative acceleration as the walker slows down.

PTG:

1. Average speed is speed over a certain amount of time. Instantaneous speed is speed at any one moment.

2. A. avg. speed= 1km/15 s =.06 km/s

B. 84m/6s = 14m/s

C. 9.6km/2hr= 4.8km/hr

D. 400km/ 4.5hr= 88.88 km/hr

3.

A. Positive

B. Positive

C. None

D. Negative

E. None

F. None. 4.

A. A, D

B. B

C. A

D. C

E.

a. Positive at a fast acceleration

b. None

c. Positive, then negative

d. Gradual positive acceleration

6.

A. The vehicle had an acceleration of -5km/h/s.

B. Negative

7. A. the velocity stays at a steady pace

B. The velocity starts out steady, then increases in velocity

C. The velocity starts out steady, then increases, and then decreases once again.

D. The velocity is slowing down, stays at a steady pace, then increases in velocity again.