This page’s flow velocity calculator does something that gets asked about every day in HVAC and plumbing design; how fast is the fluid realy flowing … Read More

When the washing machine goes round, or car swerves out of control, you feel a push across your ribs. When something rotate, that’s called centrifugal … Read More

When you drop a stone into a pond, what happens? It sinks. When you throw in a piece of wood, it floats on top. Until … Read More

The hub doesn’t move much, but the rim spins around and flies past your hand. No magic there. It is just angular velocity. How fast … Read More

Cycling into a headwind feels like you’re battling fatigue. No, it’s not. That’s drag. For every watt you generate while cycling there’s an equal and … Read More

I bet you never give any thought to what you weigh when you step onto a bathroom scale. The scale spits out a number and … Read More

The steel coil looks like nothing more than a piece of metal, but it’s really a storage container for potential energy ready to get up … Read More

To put it another way: if you have to haul a heavy suitcase up a long staircase, do you notice the difference between efficiency and … Read More

Drop your phone off your shoulder. On contact with the ground, it smashes into pieces on the concrete floor. But if you think it’s the … Read More