Projectile Motion Intro and Free-Fall Re

Projectile Motion and Free-Fall Review : 

Projectile Motion and Free-Fall Review

Do Now : 

Do Now When I toss an object up into the air, what is its velocity at the top? What is its acceleration? Take out your cell phones, don’t play with them, just take them out, turn them on and put them on your desk.

Objectives and Announcements : 

Objectives and Announcements SWBAT… Complete free-fall problems Answer conceptual questions about velocity/acceleration in free-fall motion. Announcements The “Kadin’s Movers” Problem set is due Monday (Physics A), Tuesday (Physics B and C)

Docket : 

Docket Projectile Motion Introduction Do Now Clicker Review Practice Problems HW

Docket : 

Docket Projectile Motion Introduction Do Now Clicker Review Practice Problems HW

What is Projectile Motion? : 

What is Projectile Motion? Any time an object is in free-fall, but in 2 dimensions. The object moves both horizontally AND vertically.

Text your examples : 

Text your examples http://wiffiti.com/screens/11615/

Docket : 

Docket Projectile Motion Introduction Do Now Clicker Review Practice Problems HW

Do now: When I toss an object up into the air, what is its velocity at the top? : 

Do now: When I toss an object up into the air, what is its velocity at the top? 9.8 m/s -9.8 m/s The same velocity as the one you threw it up with 0 m/s

Do Now : 

Do Now I throw a baseball straight up into the air. At the point in time when the ball is at its maximum height, what is its velocity? Velocity = 0!

Fastest Responders (in seconds) : 

Fastest Responders (in seconds)

Participant Scores : 

Participant Scores

When a ball is thrown up in the air, what is the acceleration of the ball at the peak of its motion? : 

When a ball is thrown up in the air, what is the acceleration of the ball at the peak of its motion? 9.8 m/s^2 -9.8 m/s^2 The same velocity as when you threw it up, only down 0 m/s^2

Fastest Responders (in seconds) : 

Fastest Responders (in seconds)

Participant Scores : 

Participant Scores

If I toss an object up in the air at 10 m/s, what will its velocity be when it comes back down? : 

If I toss an object up in the air at 10 m/s, what will its velocity be when it comes back down? 10 m/s -10m/s 9.8 m/s -9.8 m/s 0 m/s

Fastest Responders (in seconds) : 

Fastest Responders (in seconds)

Participant Scores : 

Participant Scores

If I drop a piano and a coin off the roof , which will hit the ground first? : 

If I drop a piano and a coin off the roof , which will hit the ground first? Piano Coin They’ll hit at the same time

Fastest Responders (in seconds) : 

Fastest Responders (in seconds)

Participant Scores : 

Participant Scores

If I throw a ball up in the air, and it lands in my hand after 6 seconds, how long did it take to get to its maximum height? : 

If I throw a ball up in the air, and it lands in my hand after 6 seconds, how long did it take to get to its maximum height? 6 seconds 12 seconds 3 seconds 1 second

Fastest Responders (in seconds) : 

Fastest Responders (in seconds)

Participant Scores : 

Participant Scores

Docket : 

Docket Projectile Motion Introduction Do Now Clicker Review Practice Problems HW

Kinematics : 

Kinematics We’re going to go back to our friends the kinematics equations. Displacement – Distance from where you started Initial Velocity – How fast you were going in the beginning Final Velocity – How fast you are going in the end Acceleration – The rate at which your velocity is changing. Time – the time in seconds between when the start and end

Slide 27: 

Mr. Kadin drops his least favorite student off of the top of the school (28 meters high). How long does the student have left to live? 28 meters -9.8m/s2 Mr. Kadin drops his least favorite student off of the top of the school (28 meters high). How long does the student have left to live?

Slide 28: 

22m vi=? Mr. Kadin is playing Call of Duty 2: Modern Warfare. He wants to throw a grenade up at a helicopter 22 meters above where he is standing so that the grenade comes to a stop at the exact height of the helicopter. How fast should he throw the grenade up? Mr. Kadin is playing Call of Duty 2: Modern Warfare. He wants to throw a grenade up at a helicopter 22 meters above where he is standing so that the grenade comes to a stop at the exact height of the helicopter. How fast should he throw the grenade up?

You try! You toss a football straight up into the air at 12 m/s, how long will it stay in the air? : 

You try! You toss a football straight up into the air at 12 m/s, how long will it stay in the air? ? m vi=12m/s

HW - Book : 

HW - Book P. 74 #42, 44, 45