chap5 - The Laws of Motion The concept of force Force is...

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1 The Laws of Motion The concept of force • Force is the cause of acceleration. • If the net force exerted on an object is zero, its velocity remains constant. • Types of forces: – Gravitational forces – Electromagnetic forces – (Nuclear forces) – (Weak forces) • When physical contact between objects is involved, one speaks of contact forces. • When forces act across empty space, one speaks of field forces.
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2 Measuring the Strength of a Force • Determine the strength of a force through the deformation of a spring. • Forces behave as vectors, so use rules of vector addition to add them. Newton’s First Law and Inertial Frames • In the absence of external forces, when viewed from an inertial frame, an object at rest remains at rest and an object in motion continues in motion with constant velocity. • A reference frame which is fixed with respect to distant stars would be the best inertial frame. • The Earth is a pretty good inertial frame. • A reference frame which moves with constant velocity relative to an inertial frame is an inertial frame itself. 1
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3 Newton’s First Law – Short Version • No force, no acceleration (meaning: When no net force acts on an object, the acceleration of the object is zero) 1 Mass • Mass is that property of an object that specifies how much
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This note was uploaded on 09/25/2011 for the course PHYS 131 taught by Professor Bennewitz during the Spring '07 term at McGill.

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chap5 - The Laws of Motion The concept of force Force is...

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