##### Francine Yu

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#### Recent Reviews by Francine

Fri Apr 30, 2010 8:53 AM
2nd Law
Mass and inertia go hand in hand. The more massive you are, the more inertia has net forces gives objects acceleration and speed, but it can also change the course of the direction. If you have a big net force, there could be a big change in direction. It’s sort of like a bigger slam to your car, more denting damage to your bumper. In terms of friction with the net force and mass, Newton’s Second Law is the least complicated for this simpleton’s brain. It’s also like the car chases in the movies, when a car is turning corners, they leave the evidence of friction on the pavement-displaying friction is larger on a curve. Being an educator to third graders, applying the formulas F = ma won’t go too far; however throwing in balloons, index cards, and straws in the mix of Newton’s Second Law, we’re going to have a FORCE FIESTA! The balloon rocket activity was something that I will definitely take back into my classroom. It was a very interactive lesson I enjoyed over the summer, when I did it with my colleagues at Stevens Institute-Summer 2009 PISA program.

Fri Apr 30, 2010 8:52 AM
1st Law
How much of a deeper understanding do I need to completely understand Forces and Motion: Newton’s First Law? I enjoyed reading the light-hearted tutorials on Newton’s First Law. The last time I had an intensive course on Physics, I was popping pimples and trying to cram for my SATs. This article covered Newton’s First Law; objects continue to stay at rest or in constant motion, until an outside unbalanced force acts upon that object. Galileo coined the term friction, a force rubbing two objects together to slow down the objects that is in constant motion in a straight line. To our naked eye, we know that a marble on a track would eventually slow down after a couple of feet, no matter how high the vertical drop. Friction is the force that slows it down. It is the outside unbalanced force. I was one of the people who had the misconception about inertia being a force, not being related to mass and weight. I did gain a better understanding from this tutorial. It helps with the graphics and activities.