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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
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

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

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