9-13- Newton'sLawsI

# 9-13- Newton'sLawsI - Chapter 5 Newtons Laws of Motion...

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1 Chapter 5 Newton’s Laws of Motion Forces and Mass Newton’s Laws Types of Forces Dynamics (Newtonian Mechanics) • What causes the motion of an object? • What is force? • What is the connection between force and Motion? Force • A force is a push or a pull on an object. • A force is a vector. It has both magnitude and direction. • A force requires an agent, something that does the pushing or pulling. • A force is either a contact force or a long-range force. Gravitational Pushing Pulling Gravitational force

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2 Newton’s first law of motion An object at rest remains at rest as long as no net force acts on it. An object moving with constant velocity continues to move with the same speed and in the same direction as long as no net force acts on it. Key insight: Force is not needed to sustain an object’s velocity, only to change it. Net force : vector sum of all the forces acting on an object. Inertia : the natural tendency of an object to remain at rest Or in motion at a constant velocity. •The law is experimentally verified in inertial frames of reference ”. Mass : a quantitative measure of inertia . Net force : vector sum of all the forces acting on an object.
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9-13- Newton'sLawsI - Chapter 5 Newtons Laws of Motion...

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