Motion in a Plane

I. 2-Dimensional Motion and Trajectories

What kinds of objects have 2 dimensional motion?

* Objects moving along earth's surface

* Planets around sun

* Pendulums

Projectiles

	Planets around Sun

Pendulums

A) Objects moving along earth’s surface (projectiles)

1. Projectile fired horizontally

What you need to know before solving this type of problem:

B) Projectile fired horizontally - Solving Word Problems

Use all the same motion equations you used before

Ex) A baseball is thrown horizontally from a grandstand 20 m above ground at speed of 10m/s.

(a) How long will the ball remain in flight before reaching ground?

Use the 3 Step Method

2. (b) What is the projectile's maximum range before it hits ground?

3. Projectile fired at an angle

Projectiles move in a parabolic path

*** To understand this type of motion we must breakup the motion into horizontal and vertical parts (components)

- Finding the horizontal and vertical components parts

¨ V -

¨ Vi x –

¨ Viy =

Use _______________________ to find ____________________________

Initial horizontal Component of Velocity - Vi _x = V cos q (on reference table)