What you might be referring to are concepts like:
* Reaction forces: Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. When you push on a wall, the wall pushes back on you with the same force. This is a reaction force.
* Friction: Friction is a force that opposes motion. When you push a box across the floor, friction acts in the opposite direction of your push.
* Drag: Drag is a force that opposes motion through a fluid (like air or water). When you run, air resistance acts against you.
It's crucial to be precise when discussing forces. "Backwards force" can be misleading because it doesn't specify the origin or direction of the force.
To understand how a force works, consider these factors:
* What is causing the force? Is it a direct push or pull, friction, gravity, or something else?
* What is the direction of the force? This is crucial for determining the effect of the force.
* What is the magnitude of the force? A stronger force will have a greater effect.
If you can provide more context about what you're interested in, I can give you a more specific explanation.
