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MASS AND WEIGHT MEASUREMENT1. Practice reading the following words. Interchangeably, quantitative, acceleration, confusion, designate, weighing, throughout, gravitational, assumption, substitution, decrease, cantilevered, equilibrium. 2. What are the units of mass and weight measurement? What do you know about mass and weight measuring devices? Discuss in groups. 3. Look at the pictures below. Find the picture which shows: equal arm balance, spring scale, torsion balance, beam balance, strain gage load cell, laboratory balances.
Picture 1 Picture 2 Picture 3
Picture 4 Picture 5 Picture 6
Read and translate text A. TEXT A Mass and weight are often used interchangeably; however, they are different. Mass is a quantitative measure of inertia of a body at rest. As a physical quantity, mass is the product of density and volume. Weight or weight force is the force with which a body is attracted toward the Earth. Weight force is determined by the product of the mass and the acceleration of gravity.
M=V´D
where M= mass V= volume D= density Note: In most books, the symbol for density is the Greek letter r.
W=M´G
where W = weight G = gravity
The embodiment of units of mass are called weights; this increases the confusion between mass and weight. In the International System of Units (SI), the modernized metric measurement system, the unit for mass is called the kilogram and the unit for force is called the newton. In the United States, the customary system the unit for mass is called the slug and the unit for force is called the pound. When using the U.S. customary units of measure, people are using the unit pound to designate the mass of an object because, in the United States, the pound has been defined in terms of the kilogram since 1893. Date: 2016-04-22; view: 884
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