Transcript Projectile Motion

Chapter 3: Projectile Motion
• Gravity, being a downward force, causes a
projectile to accelerate in the downward
direction.
• The force of gravity could never alter the
horizontal velocity of an object since
perpendicular components of motion are
independent of each other;
– vertical force does not effect a horizontal
motion.
–The result of a vertical force acting upon a horizontallymoving object is to cause the object to deviate from its
otherwise linear path
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Projectile Motion
Practice Problems pp. 664-665
1. Calculate the resultant velocity of Freda
Flyer who normally flies at 100 km/h and
then encounters a 10-km/h
headwind(wind coming from ahead).
2. Calculate Freda Flyer’s speed in a
10-km/h tailwind(wind coming from
behind).
The Truck and The Ball
• Imagine a pickup truck moving with a constant
speed along a city street.
• In the course of its motion, a ball is projected
straight upwards by a launcher located in the
bed of the truck.
• What will be the path of the ball and where will it
be located with respect to the pickup truck?
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rs/tb.html
Practice Problems pp. 664-665
12. A plane is flying at an altitude of 8000 m
at a sped of 250 m/s. At what horizontal
distance ahead of its target must a water
balloon be released to strike the target on
the ground(neglecting air resistance)?
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