The Inclined Plane

People often must move heavy things. Movers move boxes. Builders move lumber and tools. Drivers move things with their trucks. All that moving is a lot of work.

人们常常需要搬运重物。 搬家工人搬箱子。 建筑工人搬运木材和工具。 司机用卡车运送货物。 这些搬运工作可费劲啦。

There are many kinds of machines that help move things. Some are very simple. One simple machine is called an inclined plane.

有很多种机器可以帮忙搬运东西。 有些机器非常简单。 其中一种简单机械叫做斜面。

An inclined plane has a flat surface. It is higher on one end. An inclined plane is used to move things up or down.

斜面有一个平坦的表面。 它的一端更高。 斜面是用来把东西抬升或者放低的。

Ramps are inclined planes. So is a road or a path that goes up a hill. Did you know that a slide is also an inclined plane?

坡道就是斜面。 上山的公路或者小路也是斜面哦。 你知道滑梯也是斜面吗？

Which is easier for the boy to do? Lift up the box or push the box up the ramp

小男孩做哪件事更轻松呢？ 把箱子直接举起来，还是把箱子推上坡道？

If you said push the box up the ramp, you are right. The ramp is an inclined plane, so it helps you do the work.

如果你说把箱子推上坡道更轻松，那就答对啦。 坡道是斜面，所以它能帮你省力干活哦。