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1、UNIT 1 FORCES 力,Speeding up, slowing down, Floating, sinking too. These are things that happen When forces act on you!,force (力) force meter (測(cè)力計(jì)) gravity (重力) newton (牛頓) weight (重量),Lesson 1 Gravity,What makes Tom fall?,Gravity is a force. It pulls things down.,I cant see gravity.,I can feel gravi

2、ty.,Gravity makes me fall.,How can you feel gravity? Draw a picture.,What can gravity do? Circle the pictures.,Gravity gives all things their weight. A heavy thing has more weight than a light thing. We can use a force meter to measure weight.,A force has a number and a unit, like 5 newtons (5 N).,_

3、 N,What is the weight of the objects? Write the numbers.,_ N,2,3,Use a force meter to measure the weight of other objects. Write the results.,Gravity is a force. It pulls things down. Gravity gives all things their weight. A heavy thing has more weight. I can use a force meter to measure weight.,I saw gravity. I felt gravity. I measured weight.,The same apple has more weight on the earth than on the moon. Do you know why?,Earth,Moon,Workbook,What can gravity do? Draw a picture.,_ N,What

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