Is a slanted board a machine? It is if you use it to do some work. It's a kind of simple machine called an inclined plane. Inclined means \"slanted," and a plane is a flat surface. So an inclined...
How do brakes work?
> This bicycle has hand brakes---one for the front wheel and one for the > rear wheel. To stop, the rider squeezes the levers on the handle bars. Slow down! There's a busy street ahead. Stop your...
