Review!

Review Time! Which of the following as the greatest magnitude? 400 1 1 million 99 A magnet

Review Time! Which of the following quantities does not have a unit? 5 cm 5 1 kg 99 s

Review Time! Which of the following directions is positive? down over there left [N] south

Review Time! Which of the following is a scalar quantity? position distance 5 m [S] to the left to the left

Review Time! Ben is sitting in room A265 at a desk. He is 3 m from the garbage can. What object is the reference point? garbage can Ben desk room A265

Review Time! Which of the following is a vector quantity? 5 grapes 8 km/hour 9 lbs 7 km east

Review Time! Which of the following symbols will tell you if a quantity is a vector? cm [N] - Both B and C

5.5 - Position Time Graphs

position time

Position (m) [forward] Position vs. Time 30 20 Position (m) [forward] 10 1 2 3 4 Time (s)

equal different no speed change no direction change different straight line

change in position Dd change in time Dt

Dd Dt 14 m- 10 m Slope= = 5 s- 3 s = 2 m/s [E]

change rate steep big fast shallow small slow

Speed scalar vector velocity distance d df – di Dd time t tf – ti Dt

positive constant positive velocity not moving stationary negative constant negative velocity

4 m/s forward 2 m/s forward Jogger A Jogger A

Position (km) [forward] Position from Home vs. Time 10 Position (km) [forward] 5 10 20 30 40 50 60 70 Time (min)

A C B A

5s – 7s, 14s – 16s 18s – 19s 0s – 2s, 7s – 12s, 16s – 18s, 19s- 20s 2s – 5s, 12s – 14s 2s – 5s, 12s – 14s

Let’s Play a Game! You run

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)

Position (km) [forward] Time (min)