fbpx

Right-hand rule

‘Which way must I turn the bike wheel? Clockwise or counterclockwise?’ You can’t answer that because it depends on which side you look at it…

Pulleys

With a rope over a pulley you lift a load of bricks. Naturally, you must lift the whole weight $w$ of the bricks. Their weight…

Models

The finally fixed forest gravel path looks nice, smooth and flat. Perfect for a walk. You call your partner and say ‘the path is flat,…

Falsification

How do we know that Newton’s 2nd law holds true? Honestly, we don’t. We can’t prove it. But we strongly believe it does. ‘How vague!’,…