Download Why does the horizontal component of a projectile`s motion remain

Projectile Motion
Critical Question: What causes
the path of a projectile
to be curved?
A projectile is any object thrown in the air (on earth)
Projectile Motion
Critical Question: GRAVITY!!!!
A projectile is any object thrown in the air (on earth)
Projectile Motion
Gravity – two masses that apply
an attractive force towards each
other.
The amount of gravitational pull
DEPENDS on an objects mass
and distance of the objects.
The greater an objects mass, the stronger the
gravitational force.
Question:
The bigger you are (more mass) the more or
less your weight??
Projectile motion refers to the motion of an
object that is thrown, or projected into the air
at an angle.
The motion of a projectile is determined only
by the object’s initial velocity and gravity.
Projectile motion applies to sports.
Projectile motion applies to destructive
projectiles.
Projectile motion is a combination of horizontal motion and
vertical motion.
The horizontal motion of a projectile is constant because no
gravitational force acts horizontally
A projectile moves horizontally with constant velocity,
while being accelerated vertically (gravity).
The result is a motion in a curved path.
An object projected
horizontally will
reach the ground in
the same time as
an object dropped
vertically.
No matter how
large the horizontal
velocity is, the
downward pull of
gravity is always
the same.
Horizontally launched projectile
Horizontal velocity is constant. Vertical velocity is changing
due to gravitational acceleration..
Vertically launched projectile
The horizontal velocity component remains the same size
throughout the entire motion of the cannonball.
Projectiles launched at different angles.
Sports Trivia
Maximum range is achieved if the projectile is
fired at an angle of 45 degrees with respect to
the horizontal.
Test your knowledge
Suppose an airplane drops a flare while it
is moving at constant horizontal speed at
an elevated height. Assuming that air
resistance is negligible, where will the flare
land relative to the plane?
A. Directly below the plane.
B. Below the plane and ahead of it.
C. Below plane and behind it.
Test your knowledge
Suppose an airplane drops a flare while it
is moving at constant horizontal speed at
an elevated height. Assuming that air
resistance is negligible, where will the flare
land relative to the plane?
A. Directly below the plane.
B. Below the plane and ahead of it.
C. Below plane and behind it.
Why does the horizontal component of a
projectile’s motion remain constant?
Because no force acts on it horizontally.
Why does the vertical component of a
projectile’s motion undergo change?
Because gravity is pulling it downward.
Momentum – the force
gained by a moving
object
Measured by the product of mass
times velocity
p=mv
(p=momentum)
What are the units of
Momentum? (the force
gained by a moving object)
p=mv
kg m
s
(p=momentum)
Hmmm this looks familiar!!
Test your knowledge
Which is more difficult to stop? A truck that
weighs 2948.35 kg, traveling down the highway
at 35m/s or a sports car that weights 1,418 kg
traveling the same speed.
A. The Truck.
B. The sports car.
C. Both with be equally difficult to stop
Which is more difficult to stop? A truck that
weighs 2948.35 kg, traveling down the highway
at 35m/s or a sports car that weights 1,418 kg
traveling the same speed.
p=mv
A. The Truck.
Projectile Pathways
Projectile Pathways
In your spiral, with colors draw the
parabolas of each different type of
throw.
Furthest throw
Most curve
Least curve
Kicked ball (has more velocity than the throw)
The purpose is show the difference in pathways
Of a projectile being thrown.
In Conclusion
A projectile is any object upon which the only force
is gravity.
Projectiles travel with a parabolic trajectory due to
the influence of gravity.
There are no horizontal forces acting upon projectiles
and thus no horizontal acceleration.
The horizontal velocity of a projectile is constant.
there is a vertical acceleration caused by gravity
(9.8 m/s.
The horizontal motion of a projectile is independent
of its vertical motion.