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distance or displacement ? |
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Distance - the length of the path traveled. It
is not defined by the direction, it is a scalar quantity. |
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Displacement - the length and direction of a
line from the starting point to the ending point. It is a vector quantity
and must include direction. |
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speed
or velocity |
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speed - the distance per unit of time. It is a
scalar quantity. |
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average speed |
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instantaneous speed |
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Velocity - the displacement per unit of time. It
is a vector and must include direction. |
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instantaneous velocity |
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constant velocity |
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Acceleration |
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the rate of change in velocity. May be moving
faster (+ acceleration), slower (- acceleration “deceleration”) or just
changing direction. |
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Units include one unit for length and two units
of time. ie. m/s/s (m/s2) |
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constant acceleration - the change in velocity
remains the same during each successive time interval |
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What is being asked for ? |
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What is given ? |
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What facts(formula) relate what is asked with
what is given ? |
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Substitute |
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Calculate |
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CHECK THE ANSWER!! |
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Does it answer the question? |
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Does it make sense? |
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Is there a need for rounding? |
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Starting from rest (vo= 0) |
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Stopping (vf= 0) |
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Freely falling objects. |
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Acceleration in the vertical direction due to
gravity (a = g =9.8 m/s2 or 32 ft/s2) |
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Horizontal velocity is constant |
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Terminal velocity |
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A projectile is an object which after receiving
an initial velocity, is only affected by the forces of gravity and air
resistance. (We will ignore air resistance in this course) |
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Explore Science (www.explorescience.com/ |
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What direction is the initial velocity ? |
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Is this positive or negative ? |
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How does the direction of motion compare to the
direction of gravitational force ? |
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Do the signs (+ or _ ) match ? |
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Notes