Transcript Unit 11 Projectiles - Unizulu SHMD 239 Unizulu SHMD 239

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Projectile: the study of the movement of an
object that is in the air
When an object is projected into the air
(and thus becomes a projectile)two things
act to change its motion 1. Gravity and 2.
Air resistance
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The harder the ball is hit (force
applied), the further and faster the
ball will go.
Where you hit the ball (point of
applied force), will affect the
direction
How the ball is struck
(centre/to/bottom) (direction of
applied force)
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What is gravity?
The force caused by the pull of the
earth’s mass
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Drag force resists the movement of
a projectile
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What is trajectory?
The flight path of an object such as
a ball
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The range is the horizontal distance the
object travels
Horizontal distance depends on horizontal
velocity and the time the object spends
traveling at that velocity (the time of
flight)
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Angle of release is the angle at which the
object is projected into the air
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At what point in the course of a jump
does a water-ski jumper become a
projectile?
2. At what point does a pole vaulter
become a projectile during the course
of a successful vault?
3. Is it possible for the vaulter to become a
projectile more than once after leaving
the ground and still have a successful
vault? If so, how?
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The moment the ski’s leaves the surface
of the water and goes into the air
2. The moment the jumper’s body leaves
the running surface and the jumper’s
weight is placed on the vault
3. If running is determined as a projectile –
yes
If only the jump is determined as a
projectile - no
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