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16 Cards in this Set
- Front
- Back
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term describing motion
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kinematics
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the causes of motion
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dynamics
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a vector that points from the initial position to the final position, and has a magnitude that is the shortest distance between two points.
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displacement
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an objects location relative to a frame of reference (x or y axis)
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position
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what are the si units for displacement and position
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meters (m)
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the time rate of change in distance. Also what is the formula and si units?
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average speed
S-avg = d/t m/s |
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Is average speed scalar or vector?
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scalar
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the time rate of change in displacement. Also what is the formula and si units?
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average velocity
V-avg = delta x/delta t m/s |
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average velocity measured over an indefinite time period
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instantaneous velocity
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Give the formula for average acceleration
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A-avg = delta v/delta t
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Why is velocity a vector
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it has both maginitude (speed) and direction
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True or False: If velocity is constant than the acceleration is zero.
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True
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When do you use kinematic equations?
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When acceleration is constant
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List the 4 kinematic equations
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V = Vo + at
delta(x) = Vot + 1/2at^2 V^2 = Vo^2 + 2a(delta(x)) Vavg = (V + Vo) / 2 |
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What must be true of a graph for it to have constant acceleration and requiring a kinematic equation to be solved
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It must be linear. Curve in line on graph indicates that the acceleration is not uniform
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How do you indicate the magnitude of initial velocity or initial speed? Direction?
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+ or - signs |
