PHYA11H3 Chapter Notes - Chapter 5-6: Dynamic Equilibrium, Mass, Weightlessness
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PHYA11H3 Full Course Notes
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Document Summary
A force is a push or a pull. A force acts on an object: pushes and pulls are applied to something an object, from the object"s perspective, it has a force exerted on it. A force requires an agent something that acts or exerts power: a force has a specific, identifiable cause, a force is not exerted on an object unless you can identify a specific cause or agent. A force is a vector quantity: magnitude and direction, - symbol for a force, magnitude (size or strength of force) Note in the particle model, objects cannot exert forces on themselves. A force on an object will always have an agent or cause external to the object. Therefore, in the particle model, the internal forces of an object are not considered. Net force the sum of all forces o: means is defined as , mathematically this summation is called a superposition of forces, sometimes called the resultant force.