Hi Ani,
I believe you want to use a potentiometer that uses a mechanical control.
You can use the 'Potentiometer' block from Simscape Electrical Library as mentioned in the documentation page here:
It is a rotary or linear-travel potentiometer which is controlled by physical signal. You can provide mechanical input to the physical signal input 'x'.
For a working example, you can refer to an example provided in the following documentation page:
I hope it helps!
