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15 Cards in this Set
- Front
- Back
Define distance.
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A measure of space in one dimension. meter, millimeter, kilometer, centimeter or foot inch mile
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Define time.
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Based on periodic phenomena--processes that repeat over and over at a regular rate. seconds, minute, hours as far as 9 places.
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Define mass.
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A measure of how much matter is contained in it. kilogram, gram
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What are the three fundamental physical qantities used in mechanics, the branch of physics dealing with the motion of objects.
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distance time and mass
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Define speed.
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Rate of movement. Rate of change of distance from a reference point. The distance something travels divided by the time elapsed.(distance/time)
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Define Velocity.
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Speed in a particular direction. (speed + direction)
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Define acceleration
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Rate of change of velocity. (velocity/time)
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Define vectors.
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Vectors have both a numerical size and a direction associated with them.
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Define centripetal acceleration.
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The acceleration of an object moving in a circular path.
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Explain what a "derived unit" of measure is.
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length meter m
mass kilogram kg time second s |
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What are the "basic" or "fundamental" physical quantities? Why are they called that?
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Distance, time and mass.
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List the physical quantities identified in this chapter. From which of the fundamental physical quantites is each derived? Which of them are vectors, and which are scalars?
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Velocity, distance- vector
Speed - scalars time mass volume - scalars |
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What is the distinction between speed and velocity? Describe a situation in which an object's speed is constant but its velocity is not.
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speed is distance/time (straight line)
Velocity is speed + direction. While driving on a winding road the movement of the compass needle indicates that the velocity is changing even if the speed is not. |
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What is "vector addition," and how is it done?
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When you have two velocities. At the two velocities together.
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What is the relationship between velocity and acceleration?
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Acceleration indicates how rapidly velocity is changing, and velocity indicates how rapidly displacement is changing.
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