W. P. Beyermann
Fall 2007
1
The Language of Motion
How do you quantitatively describe motion in terms of
position, displacement, velocity, speed and acceleration?
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W. P. Beyermann
Fall 2007
2
Example: Sandy walks to class
Sandy, who is a student in Physics 2A, is in her dorm room and getting ready
for today’s lecture. She realizes that she needs to buy a new pen from the
bookstore. She knows that to go from her room in Aberdeen Hall to the
bookstore, she has to walk 30° west of south for 250 m. (She once made the
trip on her bicycle, which has an odometer and compass.) She also knows that
Physics 2000 is 300 m, 15° east of south from her dorm room. If an easy pace
for her is 0.75 m/s, will she be able to stop by the bookstore to buy a pen
without rushing if class starts in 12 minutes? Neglect the time she sends
buying a pen.
Model
•
Treat Sandy as a particle.
•
Neglect the time she spends buying the pen.
•
Assume she is able to walk in straight lines between her dorm room,
the bookstore, and Physics 2000.
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 Fall '08
 Beyermann
 Trigonometry, Acceleration, Velocity, Displacement, W. P. Beyermann

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