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NASA page explaining the forces involved in flight: lift, drag, thrust and weight.
Relative scale models of an atom, descriptions of size and density of the nucleus and the strong force, with good links to other sites
This is a good clear site that covers projectile motion and forces, includes diagrams and animations to help the explanations.
Java Applet showing how to find (graphically) the resultant of 1, 3, 4, or 5 forces.
Three vector forces that can be changed. The resultant vector is calculated and shown by this JAVA applet.
A simple site that contains an online alternative to plotting compass' or iron filings. The applet is very effective at showing both the direction of the force on an electron and its magnitude.
This page describes in detail the four fundamental forces of nature.
This shockwave activity provides a very basic simulation of the force on an airplane wing. Subscription required but with 30 day free trial.
One of the properties of elasticity is that it takes about twice as much force to stretch a spring twice as far. That linear dependence of displacement upon stretching force is called Hooke's law.
This java applet gives a practical demonstration of lorentz force when a charge q is applied to a magnetic field.
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