Wednesday, November 12, 2008 - Block 4A

Hand back and go over test. Collect tests.

Start Motion:

Motion - You Can't Leave Home Without It.

How far? distance measured in m, cm, miles, AU, light years
How fast? speed measured in cm/s, m/s, mph (any distance divided by any time)
How long (does it take)? time measured in seconds, minutes, years

All related by circle equation: show equation

Show graphs of distance vs time on white board for various situations:
at rest, move away at constant speed, move toward at constant speed, move away speeding up, move toward speeding up, move away slowing down, move toward slowing down.

Show graph of object at rest - horizontal line
Show graph of object moving away at constant speed - diagonal straight line. Suppose it moves 1 m in first second, another meter in another second and so on. Constant speed of 1 m/s. Show graph, find slope. Slope = rise/run = speed. Fast speed = steep slope. Cover same distance in shorter amount of time. Slow speed, low slope, takes longer to cover same distance.

Show graph with three constant speeds, slow, medium, fast. If start out slow, low slope. Then get faster - medium slope. Then get really fast - steep slope. Smooth out curve and you get increasing speed.

Ask students to graph moving towards getting slower and slower. Check graphs.

Do Act-A-Graph Lab

Homework: Act-A-Graph homework sheet.