14 projectile motion
●
acceleration is vertically downwards
–
no horizontal acceleration: constant horizontal velocity
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demo: knock 2 balls off a table (different v)
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listen for the impacts... does one hit first?
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follow ups:
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workbook problem 6.11, page 65
–
workbook problems 6.1314, page 66
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raise letters in finishing order:
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(A) 1 (B) 2 (C) 3 (D) 4 (E) 5
a
=
F
net
m
=
m
g
m
=
g
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ProblemSolving Strategy 6.1
Projectile motion problems
Model
Make simplifying assumptions.
Visualize
Use a pictorial representation. Establish a coordinate system
with the
x
axis horizontal and the
y
axis vertical. Show important
points in the motion on a sketch. Define symbols and identify what the
problem is trying to find.
Solve
The acceleration is known:
and
Thus the problem becomes one
of kinematics. The kinematic equations are
D
t is the same for the horizontal and vertical components of the
motion. Find
D
t from one component, then use that value for the other
component.
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 Fall '06
 None
 Acceleration, Sin

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