Linear Motion: Velocity and Acceleration

Linear Motion:

Velocity and Acceleration

Relative Motion

? Everything moves, even things at rest

? Relative ¨C regarded in relation to something

else; depends on point of view, or frame of

reference

? A book at ¡°rest¡±, relative to you, is actually

moving at 30 km/s with respect to the sun, and

even faster the center of the galaxy

? Unless stated otherwise, when we discuss speeds

of things in our environment, we mean speed

with respect to the surface of Earth

? Motion is relative!

Motion is relative!

Speed

Measured in meters/second [m/s]

? Speed ¨C The measure of how fast something is

moving; the rate at which distance is covered.

? Instantaneous Speed ¨C The speed at any

instant in time

? Average Speed ¨C The total distance covered

divided by the total time

Average vs. Instantaneous Speed

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