week3-2

# week3-2 - Newton's First Law of Motion An object remains at...

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Newton’s First Law of Motion • An object remains at rest, • or in uniform motion in a straight line, unless it is compelled to change by an externally imposed force.

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Newton’s Second Law of Motion • The acceleration of an object is directly proportional to the magnitude of the imposed force • and inversely proportional to the mass of the object. • The acceleration is the same direction as that of the imposed force. F m a units: 1 newton = 1 N = 1 kg m s 2
Newton’s Third Law (“action/reaction”) For every action (force), there is an equal but opposite reaction (force).

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on an object. It is also important to identify the action-reaction pairs. The forces acting on the book are W (gravitational force from Earth) and N (normal force from table). Normal force refers to the perpendicular force a surface exerts on an object. The reaction force to the Earth’s attractive force W on the book, is an equal attractive force -W the book exerts on the Earth. The reaction force to the
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## This note was uploaded on 02/05/2012 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue.

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week3-2 - Newton's First Law of Motion An object remains at...

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