If you are interested in force field effect, you can search FORCE FIELD in Unity - SHADER GRAPH. It's a video tutorial by Brackeys, and here is the Youtube Link.

The tutorial is cool, but the code generated by shader graph is not easy to read.

My version is a handwriting one for Standard Pipeline and also support back face intersecting detection.

My version is just an example, you can use it everywhere you want.

If you need more features, you can check ForceField Effects on Unity AssetStore.