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laws of motion - Chapter 5 The Laws of Motion Force Forces...

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1 Chapter 5 Chapter 5 The Laws of Motion Force Force circle6 Forces are what cause any change in the velocity of an object barb4left A force is that which causes an acceleration circle6 The net force is the vector sum of all the forces acting on an object barb4left Also called total force, resultant force, or unbalanced force circle6 When the net force is equal to zero: barb4left The acceleration is equal to zero barb4left The velocity is constant circle6 Equilibrium occurs when the net force is equal to zero barb4left The object, if at rest, will remain at rest barb4left If the object is moving, it will continue to move at a constant velocity Zero Net Force Zero Net Force
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2 Classes of Forces Classes of Forces circle6 Contact forces involve physical contact between two objects circle6 Field forces act through empty space barb4left No physical contact is required circle6 Gravitational force barb4left Between two objects circle6 Electromagnetic forces barb4left Between two charges circle6 Nuclear force barb4left Between subatomic particles circle6 Weak forces barb4left Arise in certain radioactive decay processes Fundamental Forces Fundamental Forces Newton Newton’ s First Law s First Law circle6 In the absence of external forces, when viewed from an inertial reference frame, an object at rest remains at rest and an object in motion continues in motion with a constant velocity barb4left Newton’s First Law describes what happens in the absence of a force barb4left Also tells us that when no force acts on an object, the acceleration of the object is zero
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3 Inertia and Mass Inertia and Mass circle6 The tendency of an object to resist any attempt to change its velocity is called inertia circle6 Mass is that property of an object that specifies how much resistance an object exhibits to changes in its velocity circle6 Mass is an inherent property of an object circle6 Mass is independent of the object’s surroundings circle6 Mass is independent of the method used to measure it circle6
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