1. Today is Tuesday, April 23, 2013 Homework:
-Read Chapter 13 (finish reading by Saturday)
Complete Chapter combined Homework Packet (due May 10)
Warm Up:
- Discuss in table groups: What are some things that affect motion?

2. Goal for Today
SWBAT demonstrate the ability to describe and measure motion by identifying different types of motion and how to calculate speed. SWBAT demonstrate an understanding of different types of forces by identifying and describing gravity and magnetism.

3. How can you describe motion? What are some words or phrases you use?
Types of motion
Constant motion – steady, like the Earth orbiting the Sun
Variable motion – different directions and speeds; cars
Periodic motion – motion repeated in intervals of time; pendulum, sound waves
Circular motion – wheels, helicopter blades
Vibrational motion – rubber band, drumhead

4. Pause for the Cause!
In table groups, brainstorm one more example of each type of motion and write it down on your notesheet. We will share some
One Minute (timed)

5. Average Speed
Average speed = distance an object moves during a certain amount of time
Speed = distance / time
Calculate the following:
What is the average speed: travel 120 km in 2 hrs
What is the average speed: travel 100m in 50 s

6. Velocity – speed and direction of an object
Point of reference – motion and speed measured in relation with some location
Example – moving sidewalks at the airport. Just walking on the sidewalk is one speed. But if I’m watching you from the side, you look a lot faster
Treadmill; cars moving in same or different directions
Velocity – speed and direction of an object
Force – a push or pull that acts on an object
Let’s look at some different kinds of forces – gravity, magnetism, electricity, friction

7. Gravity – a force that acts to pull pairs of objects together; force that attracts objects
Technically, all objects with mass have an attractive force (gravity)
Strength of attractive force is determines by the objects mass, and the distance between the objects
Thus objects with more mass have a stronger gravitational pull
Thus, because Earth has such a large mass in comparison to all other objects, it will pull objects towards it core. This is why things fall down
Planets pull on one another  orbits.
What would happen to an eraser thrown in space? On the moon? On Jupiter?

8. Magnetism – strongest at a magnet’s poles; is a force that pushes or pulls
Strongly pulls on objects made of iron, cobalt, nickel and gadolinium
Like poles push (repel); opposite poles pull (attract)
Explain that the maglev train uses magnetism to move (magnetic levitation)

9. It’s the Maglev Line, baby!!!!!!