1. Journal Question 05 Nov 2012 Answer the following three questions on the index card: Put your name and hour on top. 1.A force is a __________ or a ____________. 2.A balanced force: A - causes change B – does not cause change 3.An unbalanced force: A – causes change B – does not cause change

2. Inertia – Friction - Gravity Force and Motion

3. Agenda Using only your Q-notes, complete the DR. You will have 10 minutes to complete it. Predict which marble, the glass marble, a wooden marble, and a larger steel marble would be the fastest, slowest, and in the middle. Why do you think this? Next, get together with your roller coaster group and quickly re-create your original coaster. – Time a wooden marble and a steel marble along your track. Do at least 3 runs for each marble. – Record your results. – Mass the 3 marbles. Make sure you are using grams.

4. Results Add the speed results for the wooden and steel marbles to the graph you made last week. Calculate average speed at 1 second. Compare and contrast the speed results. – Which marble was the fastest? Slowest? – Did your track work for all 3 marbles?

5. Journal Question 07 Nov 2012 What is friction? How is it both harmful and useful? What examples did Bill Nye give about friction? How does friction effect your roller coaster?

6. Journal Question 09 Nov 2012 What are 2 things that effect how much friction there is between 2 surfaces? Give an example of two surfaces with a lot of friction between them. Science Court: Trial 2