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Lecture 6
Friday
2 September 2011
Chapter 3: Motion in Two or Three Dimensions
Projectile motion with no air friction
 The motions along the
x
 and
y
axes are independent
** The
x
axis velocity component is constant
** The motion along the
y
axis is the same as for an
object moving vertically under the influence of gravity
 The trajectory (
y
versus
x
) of a projectile is a parabola
• The solutions to the written and online homework sets #1 are
posted.
Go over the solutions
• Review the posted lecture slides: examples and clicker probs
• Use the Physics 221 Help Room and Supplemental Instruction
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View Full Document The cannon ball takes ___ seconds
to reach the top of its trajectory
after it is launched.
1.
1.0
2.
2.0
3.
3.0
4.
4.0
Question
A cannon ball is launched from
ground level at an angle of 30˚
above the horizontal at a speed of
40 m/s. Use
g
= 10 m/s
2
.
Solution
The time
t
that the ball takes to
reach its maximum height is
governed by its vertical motion.
The vertical component of the
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This note was uploaded on 09/05/2011 for the course PHYS 221 taught by Professor Herrerasiklody during the Spring '08 term at Iowa State.
 Spring '08
 HerreraSiklody
 Friction, Projectile Motion

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