The S.I unit for energy is...…(能量的国际标准单位）
Joule
Food contains of ............ energy. （食物含有什么能量）
chemical
When two different types of objects are rubbed together, .........are transferred from one object to the other. （两个物体摩擦，什么会转移）
electrons
...... used to detect the static electrical charges. (用什么来检测静电荷？）
electroscope
Energy cannot be ........... and ............. （能量不能被?)
created and destroyed 被创造和被毁掉
Water, solar and wind are ........... energy. （水，太阳能和风都是）
renewable energy 可更新的能源
What is the name of positive charge? 正电荷的名称是什么？
proton
What is the name of negative charge? 负电荷的名称是什么？
electron
Different charges .......... each other. （不用的电荷会怎样？）
attract 相吸
What type of energy is stored in an object that is compressed, stretched or bent ? （被压缩、拉伸或弯曲的物体中储存了哪种类型的能量？）
elastic potential energy
