##### Isabel Ramos

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#### Recent Reviews by Isabel

Sat Feb 20, 2010 3:12 PM
Excellent
The tone of this tutorial is very friendly. It appears easy to grasp the meaning of Newton's third law. To explain force on inanimate objects using electromagnetic forces among atoms in the object is a very good idea. It gives an effective correlation between the past lesson on the nature of matter and on the new lesson on force. This makes clear the action-reaction part of Newton's third law.For the fourth grade, I rather use the action-reaction concept and let them deduce that these exerted forces must be exerted simultaneously. The theory on the exerted forces being equal is hard to teach. The mathematical explanations and the assumptions are not obviously understood. I hope the students will just take my word for it.

Sat Feb 20, 2010 2:53 PM
Excellent!
The tutorial gives detailed description on how forces affect changes in motion, particularly how the different kinds of forces create the net force on an object. Among the three laws of Newton, the second law explains the relationship between force, mass, and acceleration mathematicaly. I find this law easy to teach. The tutorial gives simulations, hands-on, activities and illustrations which will be very useful to the students. These will give them direct experience to observe and understand the formula. This experience will enhance the students' qualitative undersatnding of F=ma.