PHYSICS 20 Projectile Motion PROJECTILE MOTION When an
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PHYSICS 20 Projectile Motion
PROJECTILE MOTION When an object is thrown into the air it becomes a projectile. We have already dealt with projectiles when they are thrown vertically upward or dropped This section deals with projectiles Thrown horizontally through the air Thrown into the air at an angle
OVERVIEW The projectile will always have both vertical and horizontal components These two components are independent of each other except for time of motion (flight time) The time the object travels horizontally is the same as the time the object travels vertically. If we neglect air friction
HORIZONTAL MOTION – IS UNIFORM MOTION Is described by the equation: �v =d t
VERTICAL MOTION – IS UNIFORM ACCELERATED MOTION It is described by the equations: o d = ½(vi + vf) Δt �d = vit + ½at² o d = vft - ½at² or vf² = vi² + 2 ad �a = v – v f i t Where acceleration is g = 9. 81 m/s²
PROJECTILES – THROWN HORIZONTALLY
EXAMPLE PROBLEM An object is thrown horizontally at a velocity of 20. 0 m/s from the top of a building 50. 0 m tall. How far from the base of the building did the object hit the ground? Write down what you know What are we asked to find? How are we going to do that?
EXAMPLE PROBLEM - SOLUTION Use d = vit + ½at² to find t for the vertical component What does that tell us? Then use d=vt to find horizontal distance once you know t! HOW DID YOU GUYS KNOW? BRILLIANCE I GUESS!!!
ASSIGNMENT Reading � Pearson Physics pages 102 -108 Questions � SNAP Pgs 78 -79 #’s 3 -7
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