laws of motion - 1 Chapter 5 Chapter 5 The Laws of Motion...

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Unformatted text preview: 1 Chapter 5 Chapter 5 The Laws of Motion Force Force c Forces are what cause any change in the velocity of an object b A force is that which causes an acceleration c The net force is the vector sum of all the forces acting on an object b Also called total force, resultant force, or unbalanced force c When the net force is equal to zero: b The acceleration is equal to zero b The velocity is constant c Equilibrium occurs when the net force is equal to zero b The object, if at rest, will remain at rest b If the object is moving, it will continue to move at a constant velocity Zero Net Force Zero Net Force 2 Classes of Forces Classes of Forces c Contact forces involve physical contact between two objects c Field forces act through empty space b No physical contact is required c Gravitational force b Between two objects c Electromagnetic forces b Between two charges c Nuclear force b Between subatomic particles c Weak forces b Arise in certain radioactive decay processes Fundamental Forces Fundamental Forces Newton Newton s First Law s First Law c 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 b Newtons First Law describes what happens in the absence of a force b Also tells us that when no force acts on an object, the acceleration of the object is zero 3 Inertia and Mass Inertia and Mass c The tendency of an object to resist any attempt to change its velocity is called inertia c Mass is that property of an object that specifies how much resistance an object exhibits to changes in its velocity c Mass is an inherent property of an object c Mass is independent of the objects surroundings c Mass is independent of the method used to measure it c Mass is a scalar quantity c The SI unit of mass is kg c Mass and weight are two different quantities c Weight is equal to the magnitude of the gravitational force...
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laws of motion - 1 Chapter 5 Chapter 5 The Laws of Motion...

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