Projectile motion cliff problems
Download
1 / 22

- PowerPoint PPT Presentation


  • 95 Views
  • Uploaded on

Projectile Motion – Cliff Problems. Bell Ringer.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '' - mostyn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Bell ringer
Bell Ringer

  • Recall that an object’s motion horizontally and vertically are independent. If I throw a football perfectly horizontally to the right at 5 m/s, what will its horizontal speed be after 1 second, if it hasn’t yet hit the ground? (ignore air resistance)

5 m/s

? m/s

-9.8 m/s



Reading quiz1
Reading Quiz

  • Everything away except notes if you have them

  • No harm in guessing

  • 3 Questions

  • Good Luck


What was this section about
What was this section about?

  • Projectile Motion

  • Roller Coasters

  • Circular Motion

  • Momentum


Which of these pictures did appear in the reading
Which of these pictures DID appear in the reading?

a)

  • Picture Choice 1

  • Picture Choice 2

  • Picture Choice 3

c)

b)


Which of these terms was not discussed in the reading
Which of these terms was NOT discussed in the reading?

  • Projectile

  • Parabola

  • Centripetal

  • Horizontal velocity


Objectives announcements
Objectives / Announcements

  • SWBAT…

    • Separate a projectile motion problem into its x and y pieces

    • Complete simple cliff-style projectile motion problems


Docket
Docket

  • Bell Ringer

  • Y problem

  • X Problem

  • Cliff Problems!


Docket1
Docket

  • Bell Ringer

  • Y problem

  • X Problem

  • Cliff Problems!


Do now
Do Now

  • Recall that an object’s motion horizontally and vertically are independent. If I throw a football perfectly horizontally to the right at 5 m/s, what will its horizontal speed be after 1 second, if it hasn’t yet hit the ground? (ignore air resistance)

Is there anything pushing on the ball horizontally?

No, only gravity pushes on it. If there is no push, speed doesn’t change!

5 m/s

0 m/s

After 0.5 sec

? m/s

5 m/s

After 1 sec

-9.8 m/s


Docket2
Docket

  • Do Now

  • Review Topics / Clicker Q’s

  • Y problem

  • X Problem

  • Cliff Problems!

  • HW


Projectile motion notes
Projectile Motion Notes

Projectile: An object that moves through space acted only upon by the earth’s gravity.

A projectile may start at a given height and move toward the ground in an arc.

A projectile may also start at a given level and move up and then back down.


Rules
Rules

  • Projectiles always maintain a constant horizontal velocity (w/o air resistance)

  • Projectiles always experience a constant vertical accleration of 9.8 m/s2 downward.

  • Horizontal & vertical motion are completely independent of each other.


Projectile motion cliff problems


Write this down
Write this down time it go up = the time it takes to go home.

In projectile problems, you do not need to consider the mass of the object projected. Remember, if you ignore air resistance, all bodies fall at exactly the same rate.


The horizontal component x is a constant velocity problem
The horizontal component (x) is a constant velocity problem time it go up = the time it takes to go home.

Δdx = vt


The vertical component y is a free fall problem
The vertical component (y) is a free fall problem time it go up = the time it takes to go home.

To simplify calculations, the initial vertical velocity, vyi, will be left out of all equations in which an object is projected horizontally.

So,

Δdy = (1/2)gt2


Example 1
Example 1 time it go up = the time it takes to go home.

In her physics lab, Melanie rolls a 10-g marble down a ramp and off the table with a horizontal velocity of 1.2 m/s. The marble falls in a cup placed 0.51 m from the table’s edge. How high is the table?


Projectile motion cliff problems
Batman time it go up = the time it takes to go home.flies off of the top of a 19.6 meter building at 7 m/s to the right. How far will he land from the school?

X Problem

Y Problem

Picture

Trig

7 m/s

19.6 m

?


Projectile motion cliff problems

D’andre time it go up = the time it takes to go home. throws a baseball horizontally from 2 meters off of the ground towards home plate which is 10 meters away. How fast should he throw it so that it lands on the plate?

X Problem

Y Problem

Picture

Trig

vi = ?

2m

10 m


You try
You Try! time it go up = the time it takes to go home.

X Problem

Y Problem

You are horizontally throwing water balloons at your friend from on top of a ladder. If the person is 18 meters from your ladder, and you can throw at 22 m/s, how high up the ladder should you climb?

Picture

vi = 22 m/s

?m

3.3m

18m