force is a push or pull upon an object resulting from the object’s interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., toaccelerate, or a flexible object to deform, or both.

Forces can be categorized into two major types depending on the fact that the type of force resulted due to contact or non-contact between the two objects.

Example of contact forces - Frictional Force,Applied Force,Spring Force

Example of non-contact forces - Electrical Force,Magnetic Force,Gravitational Force

Grades  Activities & Simulations (click underlined simulations to view in below window)
4th - 8th Experiment with Inertia, Forces – Action and Reaction, Forces in play – Tug-of-war game, Concept of Weight and Mass, Friction basics
8th-12th Force and Friction,Friction and Surface area, Experiment with Inertia, Friction basics, Forces – Action and Reaction, Concept of Weight and Mass


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