Post on 02-Jun-2018
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Projectile Motion
Zero Launch Angle
BellworkNotesZero Launch Angle
Finish Video Analysis Lab
Mastering Physics AssignmentExit Pass
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Question 4.2 Dropping a Package
You drop a package from a
plane flying at constant
speed in a straight line.
Without air resistance, the
package will:
a) quickly lag behind the plane while
falling
b) remain vertically under the planewhile falling
c) move ahead of the plane while
falling
d) not fall at all
Bellwork
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You drop a package from a
plane flying at constantspeed in a straight line.
Without air resistance, the
package will:
a) quickly lag behind the plane while
falling
b) remain vertically under the planewhile falling
c) move ahead of the plane while
falling
d) not fall at all
Both the plane and the package have the
samehorizontalvelocityat the moment of
release. They will maintainthis velocity in
thex-direction, so they stay aligned.
Follow-up: what would happen if air resistance is present?
Question 4.2 Dropping a Package
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Zero Launch Angle
Launch angle: direction of initial velocity with respect to
horizontal
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4-3 Zero Launch Angle
This is the trajectory of a projectile launched horizontally:
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Zero Launch Angle
In this case, the initial velocity in the y-direction is zero. Here are
the equations of motion, with x0= 0 and y0= h:
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Zero Launch Angle
In this case, the initial velocity in the y-direction is zero. Here are
the equations of motion, with x0= 0 and y0= h:
Use these equations todevelop an equation
for how the X and Y
positions are related
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Zero Launch Angle
Eliminating tand solving for yas a function of x:
This has the form y= a+ bx2, which is the equation of aparabola.
The landing point can be found by setting y= 0 and solving
forx:
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Take Out Video Analysis Handout
Under Analysis/Questions
Lets work on #5 in Lab Groups
Then well work on #s 3 & 4
Based on more general Projectile Motion concepts
Finish last two questions and turn handout in Finish both Paradigm ( Actual Plots ) and Lab handouts
Both will be graded
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Mastering Physics Assignment
Homework grade!!
Chapter 4 (Start NowDue by 2 AM 10/24) Pay attention to what is practice, extra credit, etc.
Chapter 5 (Can Start SaturdayDue by 2 AM 10/31)
2% of the 100 is deducted for each day late
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a b dc
Question 4.5 Cannon on the Moon
For a cannon on Earth, the cannonball would follow path 2.
Instead, if the same cannon were on the Moon, where g=1.6 m/s2, which path would the cannonball take in the same
situation?
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a b dc
The ball will spend more
timein flight because
gMoon< gEarth. With more
time, it can travel farther
in the horizontal
direction.
For a cannon on Earth, the cannonball would follow path 2.
Instead, if the same cannon were on the Moon, where g=1.6 m/s2, which path would the cannonball take in the same
situation?
Follow-up: which path would it take in outer space?
Question 4.5 Cannon on the Moon