| 单词 | 作用力 |
| 释义 | 作用力 When a plane's propeller, for example, spins through a cloud, the propeller exerts a rearward force. But you can also look at it qualitatively, so, if you think about the force between the electron and the proton, you could just qualitatively think about what's happening. As geologic forces pulled the crustal plate apart, new volcanoes formed in parts of the rift. Jet engines rely on Isaac Newton’s third law of motion: for every action there is an equal and opposite reaction. From the principle of work, the product of the resistance times its distance equals the product of the effort times its distance. Opposing forces of compression and release, central to continent building and to human feelings, are expressed sonically. The force is always opposing the direction of increasing potential energy, so the force will drive it back and so that's why we call this a stable equilibrium. If this picture is correct, it means that there are opposing forces at the heart of evolution. Lurking under the surface could be hidden worlds, complete with their own matter particles and forces. While it is easy to measure the effects of gravity on grander planetary or even galactic scales, the force's weakness has meant its detailed nature has been difficult to observe up until now. As a magnetic iron cobalt tip moves close to the sample, the atoms’ nuclear spins become attracted to it and generate a small force on the cantilever. So these are the only forces that act on this object. It bowed in response to the forces moving up the leg from the ground, stretching the various bone cells and forcing them to adapt, usually by adding cells, which made the bone denser. My current research is also investigating how tsunami forces change with distance from the shoreline. A proton contains three charged quarks bound by the strong force and its radius is defined as the distance at which the charge density drops below a certain value. At each time step, we calculate the forces on each atom, then we update the velocities and the positions according to Newton's second law. At each time step very small, on the order of1 femtosecond, there are in principle hundreds of millions of forces to be calculated. On USA-17, the middle hull serves as a beam to counteract those forces. These counterforces to the downturn look strong enough to end the recession before too long. Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy. The only force holding them together is gravity. One of the longest outstanding mysteries in physics is how gravity is related to the other fundamental forces, such as electromagnetism. Free fall is when the forces acting upon you are exclusively gravitational. The most likely reason: a mysterious cosmic force known as dark energy. Light’s new trick is fancier than a boring push: It created the more complicated force called lift, evident when a flow in one direction moves an object perpendicularly. Discovered in1948, Casimir forces are complicated quantum forces that affect only objects that are very, very close together. The theory’s vindication would come only with a glimpse of W and Z bosons— particles which, it posited, carried the weak force, just as photons carried the electromagnetic one. We’ll address soon some of the major puzzles of modern physics like the origin of mass, the grand unification of forces and the presence of abundant dark matter in the universe. |
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