百度试题 结果1 题目Gravity ___ everything to the ground. A. pulls B. is pulling C. pulled D. pull 相关知识点: 试题来源: 解析 A。重力把一切拉向地面是客观事实,用一般现在时 Pulls。反馈 收藏
根据“A force is a push or pull in a specific direction.”、“Gravity is a force that pulls objects together. ”和“Friction (摩擦力) pulls against the sled opposite of gravity. ”可知,本文提到了拉力、推力、重力和摩擦力共4种类型的作用力。故选D。 (3)题详解: 推理判断题。根据“Balanced...
That's because you need gravity for leaning to mean anything. It's the pull of gravity that gives you potential energy that you can turn into horizontal kinetic energy as you fall over. When you lean against acceleration you're using that to keep yourself balanced...
[translate] aYou can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you.[translate]
Different kinds of forces can act on an object at the same time. For example, when a cat on a sled (雪橇) is put on a hill, gravity (重力) will pull the sled downward. Gravity is a force that pulls objects together. It keeps everything pulled down to Earth. Gravity always works ...
Um, a fish lives in a 3 dimensional world, you know, with forces pushing and pulling it in all directions.The forces I'm referring to are gravity, which pulls the fish downward. Buoyancy, which holds it up in the water, and something called drag. ...
Other analysts argue that the threats to Western unity are overdone. The moves by Finland and Sweden to join NATO suggest not only that the alliance is pulling together but also that its center of gravity is shifting eastward. 另有分析人士认为,西方国家的团结受到威胁的看法有些夸张了。芬兰和瑞...
The more the star shrinks(收缩), the stronger the gravity inside it becomes. Soon the star is very tiny, and the gravity pulling it in is unbelievably strong. In fact, the gravity is so strong that it even pulls light into the star! Since all the light is pulled i...
Electric fields (e-fields) are an important tool in understanding how electricity begins and continues to flow. Electric fieldsdescribe the pulling or pushing force in a space between charges. Compared to Earth's gravitational field, electric fields have one major difference: while Earth's field ...
In objects not undergoing acceleration however (whether moving or stationary) are in a state of balanced forces. In a book sitting on a table for example the book is pushing down on the table with the same force that the table is pushing up....