(adsbygoogle = window.adsbygoogle || []).push({}); 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?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Energy efficiency of torsion Catapult

**Physics Forums | Science Articles, Homework Help, Discussion**