1) What is frictional force? a) Push or pull b) Surfaces rubbing against each other c) Pull of the Earth 2) The material which can attract the magnet a) Limestone b) Coal c) Iron 3) What is magnetic force? a) Force which pulls objects towards the earth b) Force created by magnet.

Force

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？