REVIEWER FOR CM2: MEASUREMENTS AND PHYSICAL QUANTITIES

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10 Terms

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MEASUREMENT

  • is a scientific comparison. When you measure, you actually compare an unknown quantity with a known standard quantity. When you use a number to describe a physical quantity, you must always specify the unit.

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SPEED

  • Its unit is the ratio of the units of length and time.

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KILOGRAM

  • The standard of mass

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QUALITATIVE

  • consisting of general observations about the system

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QUANTITATIVE

  • consisting numbers obtained by various measurements of the system.

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HYPOTHESIS

  • tentative explanation for a set of observations.

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THEORY

  • Hypotheses surviving many experimental tests to confirm their validity

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ACCURACY

  • tells us how close a measurement is to the true value of the quantity that was measured.

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PRECISION

  • refers to how closely two or more measurements of the same quantity agree with one another.

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DIMENSIONAL ANALYSIS

  • The procedure we use to convert between units in solving physics problems