Physics on Android devices with different performance

Questions & Answers
1

I’ve faced a problem: physics works (very) differently on different Android devices.

Example: say we have a ball (rigid body) and want to add power to it by tapping the screen.

Code example:

function FixedUpdate(){
     //get touch phase and add power to the ball
}

Problem:
On low-performance devices the ball gets twice less power than on high-performance devices.

Question:
How to make physics independent of device performance?

2

Input.touches should only be used in Update since the touch data is updated only each frame. FixedUpdate is called independently from the frame rate so in some cases a single touch can be seen two or more times or it could also be ignored (at high framerates)