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# Force high school

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• 1. Forces
• 2. FORCE An action exerted on an object which may change the object’s state of rest, its shape or motion is called force.
• 3.  The SI unit of force is the Newton and it is denoted by N. 1 N = 1 kg.1 m/s2
• 4. Forces can act throughcontact or at a distance If you pull on a spring, the spring stretches. If you pull on a wagon, the wagon moves. When a football is caught, its motion is stopped. These pushes and pulls are examples of contact forces. Another class of force is called field force that does not involve physical contact between two objects.
• 5. Force is a vector Because the effect of a force depends on both magnitude and direction, force is a vector quantity.
• 6. Net Force If more than one force acts simultaneously on the same object, net force is the one that determines motion of the object.
• 7. Free-body diagram A free-body diagram is used to analyze only the forces affecting the motion of a single object. Free-body diagrams are constructed and analyzed just like other vector diagrams.