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1、整理課件Speeding up, slowing down,Floating, sinking too.These are things that happenWhen forces act on you!整理課件force (力力)force meter (測力計(jì)測力計(jì))gravity (重力重力)newton (牛頓牛頓)weight (重量重量)Lesson 1 Gravity整理課件What makes Tom fall?整理課件Gravity is a force. It pulls things down.I cant see gravity.I can feel gravity.

2、Gravity makesme fall.整理課件How can you feel gravity? Draw a picture.整理課件What can gravity do? Circle the pictures.整理課件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、.整理課件_ NWhat is the weight of the objects? Write the numbers. _ N23整理課件Use a force meter to measure the weight of other objects. Write the results.ObjectWeight (N)One apple3 N整理課件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. 整理課件I saw gravity.I felt gravity.I measured weight.整理課件The same apple has more weight on the earth than on the moon. Do you know why?EarthMoon整理課件整理課件What can gravity do? Draw a picture.整理課件_ NWha

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