Physics Lect 1
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Special Triangles
3-4-5
5-12-13
30-60-90
45-45-90
Displacement vs. Time Graph
slope = instantaneous velocity
upward = positive velocity
downward = negative velocity (does not nec. mean slowing down)
straight line = constant velocity
curved line = acceleration
Velocity vs. Time Graph
slope = instantaneous acceleration
upward = positive acceleration
straight line = constant acceleration
curved line = changing acceleration
area under curve = distance / displacement
Projectile Motion: a
_{vertical }
vs a
_{horizontal}
Accel Vertical = constant = g = 10m/s
^{2}
Accel Hori = constant = 0m/s
^{2}
Projectile Motion: what dictates the time and the range of the flight path?
Vertical Velocity dictates the time of flight
Horizontal Velocity * Time dictates the range
What angle maximizes range?
45 degrees
Mass and Air Resistance
Mass changes the effect of air resistance but not the air resistance its self
air resistance has less effect on a more massive object
think bowling ball to feather
Initial Vertical Velocity for Projectiles
vsinθ = V
_{initial vertical}
Initial Horizontal Velocity
vcosθ = V
_{initial horizontal}
Remember
: there is no horizontal acceleration so the horizontal velocity remains constant through the flight path
_{ }
What increases air resistance?
more surface area
higher velocities
Projectile Motion Equations
x - x
_{i}
= v
_{i}
t + 0.5at
^{2}
v = v
_{i}
+ at
v
^{2}
= v
_{i}
^{2}
+ 2ax
v = sqrt (2gh) *v
_{i}
must be "0"
What acts to shorten the the projectile path?
Both gravity and the earth's atmosphere
Card Set Information
Author:
laskiru
ID:
58852
Filename:
Physics Lect 1
Updated:
2011-01-09 23:49:27
Tags:
Translational Motion
Folders:
Description:
Translational Motion
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