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Motion
in a Plane - Projectile Motion |
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Newton's
Revelations |
Bill Bryson's, A
Short History of Nearly Everything
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Average
Velocity ---> Instantaneous Velocity
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P180A - Problem #1,
Chapter 3
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Projectile
Motion |
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There
are two independent motions that we need to
consider.
The motion in the x-direction
and the motion in the y-direction.
A. Which motion has no forces acting on it?
B. Which motion does have a force acting on it?
Is this the true motion?
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Suppose that you are running
at a constant velocity and you wish to throw a ball such that you will catch
it as it comes back down. In what direction should you throw the ball relative
to you?
a. straight up. b.
at an angle to the ground that depends on your running speed. c.
in the forward direction. |
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A
most awesome explanation. |
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An airplane flying at a constant
horizontal velocity drops a package of supplies to a scientific mission
in the Antarctic. If air resistance is negligibly small, the path of this
package, as observed by a person in the plane, is
a. a parabola.
b. a straight line downward.
c. a straight line pointing ahead of the plane.
d. straight line pointing behind the plane. |
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Projectile
Motion
I,
II,
III,
IV,
V
, VI |
acceleration
in the y-direction only |
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As a projectile thrown upward
moves in its parabolic path, at what point along its path are the velocity
and the acceleration vectors for the projectile perpendicular to each other?
And, parallel to each other?
a. nowhere. b.
the highest point. c.
the launch point? |
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The
Monkey Problem!
I,
II |
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When
we were kids back in Nebraska, my brother Jim was able to distract me
by throwing one snowball really high and then throwing another really
low. Both hit me! Why? The
SnowBall Fight |
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Max
Height and Max Range |
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How
high?
How far? |
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Rank the launch angles for the five paths
with respect to time of flight, from the
shortest time of flight to the longest. |
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A
good example |
A
better example |
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Circular
Motion |
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Centripetal
Acceleration |
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DiMauro's
Hypothesis
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Problem
Solving |
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