Projectile+Stuff

Roll AND CATCH ball until you get a consistent time on the dual photogate. Use that TIME to determine the VELOCITY of the ball.


 * Set up your own lab paper on notebook paper: **

Title: X Marks the Spot Lab Purpose: To predict the horizontal range of a ball rolling off a table Sketch: Simple diagram of projectile with 2 measured quantities (velocity & height of desk) and a question mark Calculations: Clear complete work that shows how rolling velocity was determined and a solved projectile problem.

Place 3 pennies on the floor where you expect the ball to hit the ground.

Raise hands and wait for me to witness the release of the ball. - the HOR & VERT distance the white car traveled after leaving the ground - the angle of take -off
 * __//Discuss//__ with your group and come to agreement on reasonable estimates for: **

* A simple neat sketch of the projectile with estimated quantities labeled * Assumptions you made while estimating the values * A reasonable attempt to SOLVE the problem and determine HOW FAST? the car was going (hints below picture) * Show steps of factor label to convert your velocity to mph (If your group doesn't actually get an answer, convert __25 m/s__ to mph instead)
 * Turn in paper labeled "How Fast? Picture" that includes: **



This is tricky!

You are looking for a velocity on an angle.

There are 3 variables you don't know .....v for HOR, vi for VERT, and t

Write HOR & VERT velocities in terms of the diagonal velocity, **v .......like you broke "v" into components**

Then you are down to 2 variables, **v** and **t**

Write 2 equations (one for HOR and one for VERT) and use substitution to solve your system of equations.