PHY 205
Sections II
Lab: 4
September 20, 05
Projectile Motion
Bijaya Singh Thapa
Abstract:
In the first part of the experiment we launched ball from the projectile launcher. Once a
projectile is fired, its vertical acceleration is unaffected by a horizontal component of its
velocity. We neglect an air resistance and assume the horizontal component of velocity to
remain constant. The vertical acceleration of the projectile is the same as for a free falling
body. Therefore, if a projectile is fired horizontally from a height h, the formula h=1/2gt
2
gives us t = √2h/g as the time of flight. The projectile travels a horizontal distance d at a
constant horizontal velocity of V
o
, therefore d=V
o
t , and the initial velocity of the projectile is
V
o
= d/t.
Then we have obtain the initial velocity at which our spring gun fires the projectile, we can
predict the range of the projectile when it is fired at any angle θ above the horizontal, the
initial vertical component of the projectile velocity V
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 Spring '08
 Mishra
 Acceleration, Force, Projectile Motion, Trajectory, initial velocity, Range of a projectile

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