Metal Pulley Single
Metal Pulley Single
Student's name
First and last name, and class if you know it. This goes on the pack label.
Pickup available at Mega DC – Tweed Heads South
Usually ready in 24 hours
One pulley, metal framed, hooks at both ends - $5.40
Metal frame, plastic wheel, metal hook at each end. Sold individually.
A single pulley changes the direction of a force without changing its size, and that is the first thing a class needs to see before anything else about mechanical advantage makes sense. Pull down, the load goes up, and the effort is the same as the load.
Hooks at both ends is the detail that makes it work in a classroom. One hooks to a stand or a beam, the other takes the load - or another pulley, which is how you build a two-pulley system and halve the effort.
Metal frame, plastic wheel. The frame is the part that gets dropped and bent, so metal there is right. The plastic wheel runs quietly and does not corrode.
Sold singly, which is how pulley work should be bought: start with one to show direction change, add a second for mechanical advantage, add more for a block and tackle. At $5.40 a class can build systems rather than watch one.
Use it with the slotted weights and a hanger, a stand and clamp, and a spring balance to read the effort. All sold separately.