View Single Post
lovemake1 is offline
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
Lemurs match scent of a friend to sound of her voice
Repeated self-healing now possible in composite materials
'Heartbleed' fix may slow Web performance