View Single Post
May6-10, 07:59 PM
P: 150
1. The problem statement, all variables and given/known data

How would you find the energy efficiency of a torsion catapult ? (one i built for project)

I have the Force at which im pulling the arm.
F = 20N

also the angle from origin to the point of release ( or when the ball leaves the arm)
Theta = 50 degrees

2. Relevant equations

Energy Efficiency = Energy Output/ Energy Input
E input =

3. The attempt at a solution

i have filmed the trajectory of my catapult using Video camera and logger pro software.
i do have velocity and acceleration in both x and y directions.

But how do i exactly find the Input energy of this particular system?
Phys.Org News Partner Science news on
Security CTO to detail Android Fake ID flaw at Black Hat
Huge waves measured for first time in Arctic Ocean
Mysterious molecules in space