Today is Tuesday, April 23, 2013 Homework: -Read Chapter 13 (finish reading by Saturday) Complete Chapter 13-14 combined Homework Packet (due May 10) Warm Up: - Discuss in table groups: What are some things that affect motion?

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.

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

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)

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

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

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?

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)

It’s the Maglev Line, baby!!!!!!