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Lecture 4 Dimensional Consistency 8-29-11

# Lecture 4 Dimensional Consistency 8-29-11 - Mass and Weight...

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1 Difference Between Weight and Mass Gravitational conversion g c Dimensional Consistency Mass, Moles, and MW Density, Specific Gravity, Specific Volume Types of Pressures Lecture Topics Though the terms weight and mass are used interchangeably in common language, in science there is distinct difference between the two terms. weight of an object = force of gravity felt by that object mass of an object = the amount of matter the object has. Mass and Weight An object's weight depends on the pull of the gravitating object but the object's mass is independent of the gravity. weight on the Moon = 1/6 weight on Earth Weight = mass * gravitational acceleration = mg g = 9.8066 m/s 2 g = 980.66 cm/s 2 g = 32.174 ft/s 2 Another way to look at it is, mass is a measure of the object's resistance to acceleration: a push on a skateboard will make it roll away quickly but the same push on a more massive car will barely budge it. Newton’s Second Law Force = mass * acceleration F = m * a In the old English unit system, there is a ``pound'' of force (lb f ) and ``pound'' of mass ( lb m ). Only on the Earth's surface, an object's pound of mass = the number of pounds of force felt by the object due to the Earth's gravity.

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Lecture 4 Dimensional Consistency 8-29-11 - Mass and Weight...

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