Projectile Motion

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Projectile Motion

• By
• Mujahed Khan
• Eman Nader
• Lorenz Schuerch

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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

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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
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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

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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
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Quiz Questions

1. 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?
2. 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?
3. 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?
4. If you drop a ball from rest what information do
   you need to predict how time it will take to hit
   the floor?

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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