Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Physics

Work and Energy

Quick fact

You do zero work on a wall when you push against it and it doesn't move, no matter how tired you get – because work requires displacement in the direction of the applied force.

Why this is interesting

Have you ever wondered why pushing a heavy box across the floor makes you feel tired, even if you're just holding it steady? The answer lies in how we define 'work' and 'energy' in physics.