Question: What happens if an unstoppable force meets an immovable object?

  1. Hi hesha. Now this is a question that pops up from time to time and it’s a well known problem. It even has a name, The Irresistible Force Paradox.

    The biggest problem with this is that an unstoppable force was to exist, then an object that you could not move at all is unable to exist at the same time. This force is unstoppable by anything so for this to exist it would have to be able knock over everything. It’s the same going the other way. If you have an object that was immovable, then no force can ever move it.

    But let’s assume that there was an object that could not be moved. Isaac Newton came up with three laws of motion and one of them was about how move. He said that every object likes to move in a straight line and resists its path to change. He also said that if an object was at rest, it likes to stay at rest. This resistance to the change in how something is moving or in some cases, not moving was given the name inertia.

    If something was to have infinite inertia it would also need infinite mass because the two are related. Generally the more mass an object has, the more inertia it has. There is a problem with having a lot of mass. If you get large enough to say the size of a planet, gravity starts playing a bigger role. Since we’re talking all the mass available ever, the gravity of this really large object would collapse on itself and create a black hole. So much for the object.

    So let’s look at the unstoppable force. For this we need an unlimited amount of energy and this isn’t possible. Energy when used is converted into something useful and does things and this is called Work and when this is done, a percentage of it is lost as heat.


  2. Yes, this is more to do with word play than reality. Either thing on its own can’t really exist. The problems come when you play with “infinites” – things that are the maximum possible something. “What happens when you mix infinitely black paint with infinitely white paint” – don’t worry about it. We can play with real examples, but since we don’t get infinite paints, let’s not worry. The only time I’m thinking it’s useful to think of infinites is in calculus – you’ll do that in maths. When you do you’ll say to yourself “oh yeah, that’s useful”


  3. this is just a word play – by definition both cannot exist in the same universe.


  4. The end of everything. For neither can conquer the other, yet by their very nature, neither can admit defeat.

    It would be an impossible situation so everything would just have to ……end.




  1. Ha i saw that in the dark knight