It’s the 22nd, and you did not pay rent yet. The landlord is at the door. You rent is…

• Your first day at the job as a monkey feeder. Your banana cannon is LOUD and scares the monkey - and he lets go of the tree the instant he hears the cannon. To feed the monkey do you aim at the monkey, above the monkey or below the monkey?

• Draw a picture of the displacements….

Please Turn in Your Do Nows…

Objectives

• You should be able to identify the motion in the y-direction of a ground launched projectile which will allow you to solve the problem for time, height and then distance in the x-direction !

• Homework – Castle Learning – GLP2 – Finish Worksheet !

• TEST FRIDAY – 1D and 2D motion !

What is a projectile?

• A flying object with no means of propulsion after its launch.

• Can be launched with any VELOCITY and at ANY ANGLE

• May be subjected to AIR RESISTANCE

Initial velocity

30°

What is the horizontal part ofthe soccer ball’s initial velocity?

vix = vi cos θ

What is the vertical part ofthe soccer ball’s initial velocity?

viy = vi sin θ

12 m/s6 m/s

10.4 m/s

What assumptions can we make?

Horizontal

• Initial velocity = vi cos θ

• Acceleration = 0

Vertical

• Initial velocity = vi sin θ

• Acceleration = -9.81 m/s2

• Vertical speed = 0 at top

Projectile Vector Diagram

t1/2 vfy = 0 (at top)

x y

a = 0 a = -9.81 m/s2

vi = vi cos θ vi = vi sin θ vf = 0 (at top)

ttot = 2t1/2

ttot

Simulation

• What would you predict might be the angle that produces the longest shot?

• What about the highest?

• ..\Week 8\projectile-motion_en (1).jar

Practice Problems

Worksheet