|Inclined Plane | Wedge | Screw | Lever | Wheel and Axle | Pulley||Back to Step 1|
Remember, there's always a trade-off. The way an inclined plane works is that to save effort, you must move things a greater distance. If you compare the length of a ladder to that of a staircase going to the same height, you'll find the ladder is much shorter. But it takes a lot more effort to climb a ladder than to simply walk up a flight of stairs. The ancient Egyptians figured this out over 3,000 years ago when they built their pyramids. They used long, shallow ramps to help them move the heavy stones to the top!