Transcript Projectile Motion

Projectile Motion
By:
Mujahed Khan
Eman Nader
Lorenz Schuerch
Terms


Projectile- is an object upon which the only force acting
is gravity, it is any object which once projected
continues in motion by its own inertia and is influenced
only by the downward force of gravity.
Parabola-a plane curve formed by the intersection of a
right circular cone and a plane parallel to an element of
the curve
Concept
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The concept of a projectile motion is that an
object an that follows moving in constant
horizontal velocity and also drops due to the
force of gravity, just like free fall except it
does not immediately hit the ground when it
is released.
Examples of Projectile
The Laws of Projectile Problems
1.Draw a picture
2. Write givens in terms of x and y
3. Decide what to solve for
4. In horizontal use V=d/t
5. In vertical use d=vit+1/2atsquared or 2ad=Vfsquared –Visquared
6. If problem is horizontal vi=om/s in vertical
7. If problem relates to an angle, use SOHCAHTOA
8. If problem dt, vf at top of path=0m/s
9. A=-9.8 m/s in vertical
10. Solve your problem
Sample Problems
If you drop a water balloon from a 5
meter tall ledge. How long does the
balloon take to reach the ground?
Equation: d=vit+½atsquared
acceleration=-9.8
initial velocity= 0m/s
distance=5m
time=?
5m=(0m/s)+½(-9.8)(tsquared)
½(-9.8)=-4.9
5/-4.9=-4.9tsquared/-4.9
Time= 1 Second
1.
2. A potato is shot horizontally out of a
cannon with a speed of 60m/s at a
target 70m away. How long does
the potato take to travel the
horizontal distance?
Equation: Velocity=distance/time
Velocity=60m/s
60m
distance=70m/s
time=?
60=70/t
70m
time=1.16 seconds
Quiz Questions
1.
2.
3.
4.
Lorenz wants to ride his bicycle at 10 m/s at heading 40
degrees NE. How much of his velocity is north and how much
is east?
A bullet is fired horizontally at a target 50 meters away, and it
has dropped 0.5 meters by the time it reaches the target, how
long does it take to drop?
Eman decides to jump of a cliff, she jumps horizontally at
3m/s from a 25 meter tall cliff. Below her, rocks extend form
the base of the cliff for 5 meters. Will the she clear the rocks?
If you drop a ball from rest what information do you need to
predict how time it will take to hit the floor?
Answers
1. horizontal velocity is 6.43m/s and vertical
velocity is 7.7m/s
2. time is .32seconds
3. Yes she will clear the rocks
4. You need Distance,Acceleration, Initial
Velocity, and Time