What is the force that pulls objects towards the earth? A. Magnetic force B. Gravitational force C. Electrical force D. Frictional force 相关知识点: 试题来源: 解析 B。A 选项磁力有特定的磁性物体才会产生吸引力;C 选项电力是与电荷相关的力;D 选项摩擦力是阻碍物体相对运动的力。而重力是地球对...
What is the name of the force that pulls objects towards the Earth? A. Electromagnetic force B. Gravitational force C. Nuclear force D. Frictional force 相关知识点: 试题来源: 解析 B。解析:引力是使物体向地球下落的力。选项 A 电磁力、选项 C 核力、选项 D 摩擦力都不是使物体向地球下落的力...
What is the name of the force that pulls objects towards the Earth? A. Magnetic force B. Electric force C. Gravitational force D. Frictional force 相关知识点: 试题来源: 解析 C。解析:使物体向地球下落的力是重力。文章中有关于力的介绍。选项 A 磁力不是使物体向地球下落的力。选项 B 电力与...
What is the force that pulls objects towards the center of the Earth? A. Magnetism B. Gravity C. Electricity D. Friction 相关知识点: 试题来源: 解析 B。解析:重力是使物体向地球中心下落的力。A 选项磁力、C 选项电力、D 选项摩擦力都不是使物体向地球中心下落的力。
What is the name of the force that pulls objects towards the center of the Earth? A. Gravity B. Magnetism C. Electrical force D. Friction 相关知识点: 试题来源: 解析 A。解析:重力是使物体向地球中心吸引的力。磁力是由磁体产生的力。电力是由电荷产生的力。摩擦力是阻碍物体相对运动的力。
与美国小学生一起学英文 Gravity What happens if you drop a book?Absolutely, it will fall down to the floor. This is called gravity. Gravity pulls from the center of the Earth.So things fall down to the ground because of gravity.Do you know what would happen without gravity?Everything woul...
Rain falls from clouds for the same reason anything falls to Earth. The Earth's gravity pulls it. But every cloud is made of water droplets or ice crystal(冰晶). Why doesn't rain or snow fall constantly from all clouds? The droplets or ice crystals in clouds are extremely small. The ...
used to describe the physics of circular motion — but only one of them is real. The centripetal force keeps an object moving in a circle and is always pointed toward the center of that circle. For instance, the gravitational force of the sun is a centripetal force that keepsEarthorbiting ...
Rain falls from clouds for the same reason anything falls to Earth.The Earth's gravity pulls it.But every cloud is made of water droplets or ice crystal(冰晶).Why doesn't rain or snow fall constantly from all clouds?The droplets or ice crystals in clouds are extremely small.The effect ...
The gravitational force tugging between two bodies depends on how massive each one is and how far apart the two lie, according toNASA Glenn Research Center. Even as the center of theEarthis pulling you toward it (keeping you firmly lodged on the ground), your center of mass is pulling bac...