Lecture 7
pls7.1
2D Motion
Media:
1. Tennis ball
2.
Shoot the monkey demo
3.
Cart with firing ball
1.
2D Motion
Two dimensional (2D) motion is motion where an object moves in a plane.
Examples:
The arc of a thrown tennis ball lies in a
plane (if the effects of air are negligible).
Another
example includes the motion of pool balls on a pool
table (until they fall in a pocket!).
For 2D motion all
three kinematics vectors – position, velocity, and
acceleration – lie in the same
plane, as illustrated in the drawing below.
It takes two axes (
x
and
y
) to describe such motion.
Vector
components of
()
t
r
r
along a set of
x

y
axes are also indicated in the
drawing.
( )
t
r
r
+
x
+
y
( )
t
v
r
( )
t
a
r
( )
t
x
r
r
or
( )
t
x
r
()
t
y
r
r
or
()
t
y
r
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pls7.2
2.
2D Motion with Constant Acceleration
If acceleration is constant, then the acceleration vector is constant
(constant magnitude
and direction
) during the motion of the object.
Its
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 Fall '11
 KODERA
 Physics

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