![Le mouvement et les types de forces](http://s1.studyres.com/store/data/009098575_1-c50585184aec6426dc0a93e3669b041a-300x300.png)
Ch. 7 notes new
... Why doesn’t the Earth move up towards the boulder? Is this true? Reaction forces occur slightly after the action force is applied. NO!! They occur simultaneously See page 109, figure 7.5 https://www.youtube.com/watch?v=jHbyQ_AQP8c “What if we all jumped at once?” ...
... Why doesn’t the Earth move up towards the boulder? Is this true? Reaction forces occur slightly after the action force is applied. NO!! They occur simultaneously See page 109, figure 7.5 https://www.youtube.com/watch?v=jHbyQ_AQP8c “What if we all jumped at once?” ...
Physics 121 Exam Sheet - BYU Physics and Astronomy
... implies a cause-effect relation between the two forces which are associated with any interaction. In reality, neither force of a force pair is more fundamental than the other and neither should be viewed as the cause of the other. All forces occur in pairs. There are no isolated forces. Fundamental ...
... implies a cause-effect relation between the two forces which are associated with any interaction. In reality, neither force of a force pair is more fundamental than the other and neither should be viewed as the cause of the other. All forces occur in pairs. There are no isolated forces. Fundamental ...
Chapter 44
... The strong force, mediated by gluons, holds the quarks together to form composite particles Leptons participate only in electromagnetic and weak interactions The electromagnetic force is mediated by ...
... The strong force, mediated by gluons, holds the quarks together to form composite particles Leptons participate only in electromagnetic and weak interactions The electromagnetic force is mediated by ...
Teaching ideas for Topic 2: Mechanics, Core
... The formulae for kinematics apply for constant acceleration only, and this has to be stressed. It is very important to stress that acceleration is defined in terms of velocity and not speed. The power of graphs in analysing motion can be appreciated with questions such as problem 32 on page 61 of th ...
... The formulae for kinematics apply for constant acceleration only, and this has to be stressed. It is very important to stress that acceleration is defined in terms of velocity and not speed. The power of graphs in analysing motion can be appreciated with questions such as problem 32 on page 61 of th ...
PROBLEM SET AP1 Vectors
... a. What is the magnitude and direction of the resultant force? b. What is the magnitude and direction of the equilibrant force? 2. A hiker leaves camp and walks 10 km due North and 10 km due West. a. What is the distance walked by the hiker? b. What is the displacement of the hiker from the starting ...
... a. What is the magnitude and direction of the resultant force? b. What is the magnitude and direction of the equilibrant force? 2. A hiker leaves camp and walks 10 km due North and 10 km due West. a. What is the distance walked by the hiker? b. What is the displacement of the hiker from the starting ...
Nuclear force
![](https://commons.wikimedia.org/wiki/Special:FilePath/ReidForce2.jpg?width=300)
The nuclear force (or nucleon–nucleon interaction or residual strong force) is the force between protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei. Neutrons and protons are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience a Coulomb repulsion that tends to push them apart, but at short range the nuclear force is sufficiently attractive as to overcome the electromagnetic repulsive force. The mass of a nucleus is less than the sum total of the individual masses of the protons and neutrons which form it. The difference in mass between bound and unbound nucleons is known as the mass defect. Energy is released when nuclei break apart, and it is this energy that used in nuclear power and nuclear weapons.The nuclear force is powerfully attractive between nucleons at distances of about 1 femtometer (fm, or 1.0 × 10−15 metres) between their centers, but rapidly decreases to insignificance at distances beyond about 2.5 fm. At distances less than 0.7 fm, the nuclear force becomes repulsive. This repulsive component is responsible for the physical size of nuclei, since the nucleons can come no closer than the force allows. By comparison, the size of an atom, measured in angstroms (Å, or 1.0 × 10−10 m), is five orders of magnitude larger. The nuclear force is not simple, however, since it depends on the nucleon spins, has a tensor component, and may depend on the relative momentum of the nucleons.A quantitative description of the nuclear force relies on partially empirical equations that model the internucleon potential energies, or potentials. (Generally, forces within a system of particles can be more simply modeled by describing the system's potential energy; the negative gradient of a potential is equal to the vector force.) The constants for the equations are phenomenological, that is, determined by fitting the equations to experimental data. The internucleon potentials attempt to describe the properties of nucleon–nucleon interaction. Once determined, any given potential can be used in, e.g., the Schrödinger equation to determine the quantum mechanical properties of the nucleon system.The discovery of the neutron in 1932 revealed that atomic nuclei were made of protons and neutrons, held together by an attractive force. By 1935 the nuclear force was conceived to be transmitted by particles called mesons. This theoretical development included a description of the Yukawa potential, an early example of a nuclear potential. Mesons, predicted by theory, were discovered experimentally in 1947. By the 1970s, the quark model had been developed, which showed that the mesons and nucleons were composed of quarks and gluons. By this new model, the nuclear force, resulting from the exchange of mesons between neighboring nucleons, is a residual effect of the strong force.