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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

- 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.

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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 Vd/t
- 5. In vertical use dvit1/2atsquared or

2adVfsquared Visquared - 6. If problem is horizontal viom/s in vertical
- 7. If problem relates to an angle, use SOHCAHTOA
- 8. If problem dt, vf at top of path0m/s
- 9. A-9.8 m/s in vertical
- 10. Solve your problem

Sample Problems

- 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 Velocitydistance/time
- Velocity60m/s
- distance70m/s
- time?
- 6070/t
- time1.16 seconds

- If you drop a water balloon from a 5 meter tall

ledge. How long does the balloon take to reach

the ground? - Equation dvit½atsquared
- acceleration-9.8
- initial velocity 0m/s
- distance5m
- time?
- 5m(0m/s)½(-9.8)(tsquared)
- ½(-9.8)-4.9
- 5/-4.9-4.9tsquared/-4.9
- Time 1 Second

60m

70m

Quiz Questions

- 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