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

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