98 Things Move-Mid

Things Move Written by Rhonda Lucas Donald

朗达·卢卡斯·唐纳德著

All around you, things are moving. Cars roll, birds fly, balls bounce, and kids run. Some things move on their own. Other things have to be moved. Some things speed up. Other things slow down. Some move in a line. Others move in circles.

在你周围，事物都在移动。 汽车滚动，鸟飞，球弹，孩子跑。 有些东西会自己移动。 其他的东西必须被移动。 有些事情会加速。其他事情会慢下来。 有的排成一行。其他人则在原地打转。

Let's learn what makes things move. Let's also learn why things move in different ways.

让我们来学习是什么让物体运动。 我们也来了解一下为什么物体会以不同的方式运动。

Look at the two pictures. How are the bikes in the two pictures different? The bikes in the first picture are at rest. The bike the boy is riding is in motion. What makes some bikes move?

看这两幅图。这两幅画中的自行车有什么不同? 第一幅图中的自行车处于静止状态。 那男孩骑的自行车正在运动。 是什么让自行车移动?

Things move because of something called a force A push is a force. A pull is a force, too. When you push a scooter or pull a sled, you use force to move things.

物体移动是因为一种力，推力也是一种力。 拉力也是一种力。当你推滑板车或拉雪橇时，你用力来移动东西。

Things can't move on their own. They stay at rest until a force moves them. A force can make things move in different ways. A force can even stop moving things. Think About It Push or kick a ball with one of your feet. It moves away. Step on the ball and it stops.

事物不能自己移动。 它们静止不动，直到有力量推动它们。 力可以使物体以不同的方式运动。 力甚至可以阻止物体移动。 用一只脚推球或踢球。 它移开了。踩一下球，它就停了。