3/3 WORK

I will be calling on Skype to catch up with you.   All material from last week is due tomorrow, 3/4   Give it to Mrs. Deutmeyer, send it to me by email, or send me pictures of what you have done using your phone.

Activities for this week:

Read p. 52 on Hooke's law.   Hooke's law and Force weight are two ways to measure force, which is the formula for Newton's Second Law

Hooke's Law uses the stiffness of a spring to measure the weight of an object.   This is portrayed by the graph on pp. 50 or the words on pp. 52

In other words,

a mass (kg) * an acceleration (usually the acceleration due to gravity on earth ,9.8 m/s/s) = Force (Newtons)

F = m a     is Newton's Second Law

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As we design a roller coaster, we have to worry about the weight of the cart, the weight of the riders, and the weight of the coaster itself.  All these things are important to a roller coaster designer. 

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Read pp. 57-62   Fill out the chart on pp. 62,  AND #9 ON P. 63 and fill it out.  To do this, you will need spring scales (the spring scale drawer is labelled) and a about 200 grams of mass, or .2kg   There are drawers marked spring scales and weights.  Instead of getting in the roller coaster or elevator, the scale will serve the purpose of the elevator, and the weight attached to it (use string or paper clips or weight) will represent the person in the vator.  TAKE A PICTURE OF YOUR TABLE/ANSWERS AND SEND IT TO ME, WITH YOUR GROUP MEMBER NAMES ON IT.

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Skim through http://www.physicsclassroom.com/mmedia/newtlaws/cci.cfm and 

http://www.physicsclassroom.com/Class/newtlaws/u2l1b.cfm

Journal question:   HOW WILL INERTIA AND FRICTION AFFECT MY COASTER?

On our next class day, you will be building a coaster.   You will need to bring roller coaster track (hot wheels) and a hot wheels carr.