Atoms
Celestial Bodies
- Space Travel Equipment
- Stars
- Rotation and Revolution
- Relation Between Escape Velocity And Orbital Velocity
- Dwarf Planets
- Difference Between Solar Eclipse And Lunar Eclipse
- Difference Between Equinox And Solstice
- The Escape Velocity Of Earth
- Solar System
- Difference Between Stars And Planets
- Difference Between Asteroid And Meteoroid
- Constellations
Circuits
电路 (diàn lù)
电路 (Diànlù)
电路
通信系统Pdf
二极管
地球科学
电荷
电
- 类型的齿轮
- 电子产品在日常生活中
- 类型的汽车
- 类型的直流电机
- 类型的交流电机
- 晶体管工作
- 转矩电流环
- 电动机
- 电阻温度依赖性
- Rms值交流电
- 电抗和阻抗
- 相量表示法交流
- 平行板电容器
- 焦耳定律
- 电力
- 磁场对载流导线的影响
- 电流密度
- 导体绝缘体
- 导电
- 碳电阻器
- 直流发电机
- 类型的发电机
- 类型的电流
- 直流发电机类型
- Torque On Dipole
- 电流的热效应
- 电动发电机
- 静电
- 电阻率不同的材料
- 电场的物理意义
- 介电常数和磁导率
- 电能和权力
- 电流在导体
- 电动汽车
- 位移电流
- 电阻与电阻率之间的差异
- 电动机和发电机之间的区别
- 接地和接地之间的区别
- 电流线圈
- 水的电导率
- 导电的液体
Electricity
电磁波
电磁
静电学
能量
- 能量
- 能源类型
- 热能
- 太阳能项目
- 太阳能汽车
- Ev和Joule之间的关系
- 动能和完成的功
- 能量转换
- 一维和二维的弹性和非弹性碰撞
- 常规能源和非常规能源
- 太阳能炊具
- 潮汐能
- 能源
- 太阳能和光伏电池
- 动能与动量的关系
- 热量与焦耳的关系
- 能源及其对环境的影响
- 能源考虑
流体
武力
Force
摩擦
万有引力
热
动力学理论
光
- 镜面反射漫反射
- 人眼
- 结构人眼功能
- 阴影的形成
- 反射和折射之间的区别
- 相干源
- 光的透射、吸收和反射
- 透明半透明和不透明
- 阳光白色
- 单狭缝衍射
- 拉曼散射
- 粒子自然光光子
- 真实图像与虚拟图像的区别
- 衍射和干涉的区别
磁性
运动
- 运输历史记录
- 速度-时间图
- 旋转动能
- 刚体和刚体动力学
- 扭矩和速度之间的关系
- 粒子的直线运动
- 周期性运动
- 动量和惯性之间的差异
- 动量守恒
- 运动测量类型
- 扭矩
- 慢速和快速运动
- 滚动
- 刚体平移运动和旋转运动
- 相对速度
- 径向加速度
- 速度和速度之间的区别
- 动力学和运动学的区别
- 连续性方程
- 线性动量守恒
自然资源
核物理学
光学
Optics
- Reflection of Light and Laws of Reflection
- Concave Lens
- Total Internal Reflection
- Thin Lens Formula For Concave And Convex Lenses
- Spherical Mirror Formula
- Resolving Power Of Microscopes And Telescopes
- Refractive Index
- Refraction Of Light
- Refraction Light Glass Prism
- Reflection On A Plane Mirror
- Reflection Lateral Inversion
- Rainbow
- Photometry
- Difference Between Simple And Compound Microscope
- Difference Between Light Microscope And Electron Microscope
- Concave Convex Mirror
- Toric Lens
- The Lens Makers Formula
- Simple Microscope
Oscillation
Pressure
- Thrust Pressure
- Relation Between Bar And Pascal
- Regelation
- Sphygmomanometer
- Relation Between Bar And Atm
- Difference Between Stress And Pressure
Quantum physics
- Quantum physics
- Rydberg Constant
- Electron Spin
- Casimir Effect
- Relativity
- Quantum Mechanics
- Electrons And Photons
Radioactivity
- Relation Between Beta And Gamma Function
- Radioactivity Beta Decay
- Radioactive Decay
- Stefan Boltzmann Constant
- Radioactivity Gamma Decay
- Radioactivity Alpha Decay
- Radiation Detector
Scalars and Vectors
- Scalars and Vectors
- Triangle Law Of Vector Addition
- Scalar Product
- Scalar And Vector Products
- Difference Between Scalar And Vector
Scientific Method
- Scientific Methods
- Safety Measures Technology
- Difference Between Science And Technology
- Scientific Investigation
Semiconductors
- Semiconductor Devices
- Junction Transistor
- Semiconductor Diode
- Difference Between Npn And Pnp Transistor
Solid Deformation
- Solid State Physics
- Solid Deformation
- Stress
- Shear Modulus Elastic Moduli
- Relation Between Elastic Constants
- Elastic Behavior Of Solids
- Tensile Stress
- Stress And Strain
- Shearing Stress
- Elastomers
- Elastic Behaviour Of Materials
- Bulk Modulus Of Elasticity Definition Formula
Sound
- Sound waves
- Timbre
- Speed Of Sound Propagation
- Sound Waves Need Medium Propagation
- Sound Reflection
- Sound Produced Humans
- Doppler Shift
- Difference Between Sound Noise Music
- The Human Voice How Do Humans Create Sound With Their Vocal Cord
- Sound Vibration Propagation Of Sound
- Sound Produced Vibration Object
- Reverberation
- Doppler Effect
System of Particles and Rotational Dynamics
Thermal Properties of Matter
- Thermal Properties of Materials
- Thermal Stress
- Thermal Expansion Of Solids
- Thermal Conductivity Of Metals
Thermodynamics
- Statistical Physics
- SI Units List
- Statistical Mechanics
- Reversible Irreversible Processes
- Carnots Theorem
- Temperature
- Kelvin Planck Statement
- Difference between Isothermal and Adiabatic Processes
Units and measurements
- Density of Air
- The Idea Of Time
- Difference Between Pound And Kilogram
- Difference Between Mass And Volume
- Dimensional Analysis
- Density Of Water
- Time Measurement
- Standard Measurement Units
- Relation Between Kg And Newton
- Relation Between Density And Temperature
- Difference Between Mass And Weight
Waves
- Space Wave Propagation
- Sharpness Of Resonance
- Relation Between Group Velocity And Phase Velocity
- Relation Between Amplitude And Frequency
- Periodic Function
- P Wave
- Destructive Interference
- Transverse Waves
- Travelling Wave
- Standing Wave Normal Mode
- S Waves
- Relation Between Frequency And Velocity
- Reflection Of Waves
- Phase Angle
- Period Angular Frequency
Work, Energy and Power
- Derivation Of Work Energy Theorem
- Conservation Of Mechanical Energy
- Relation Between Work And Energy
- Destruction Caused Cyclones
Physics Experiments
- Determine Resistance Plotting Graph Potential Difference versus Current
- To find the weight of a given Body using Parallelogram Law of Vectors
- To study the variation in volume with pressure for a sample of air at constant temperature by plotting graphs between p and v
- To measure the thickness of sheet using Screw Gauge
- To find the value of V for different U values of Concave Mirror find Focal Length
- To find the Surface Tension of Water by Capillary Rise Method
- To find the Resistance of given wire using Metre Bridge and hence determine the Resistivity of its Material Experiment
- Determine Mass of Two Different Objects Using Beam Balance
- Tracing the path of the rays of light through a glass Prism
- Tracing path of a ray of light passing through a glass slab
- Tornado Bottle
- To find image distance for varying object distances of a convex lens with ray diagrams
- To find force constant of helical spring by plotting a graph between load and extension
- To find focal length of concave lens using convex lens
- To find effective length of seconds pendulum using graph
- To find downward force along inclined plane on a roller due to gravitational pull of the earth and its relationship with the angle of inclination
- To draw the IV characteristic curve for p n junction in forward and reverse bias
- To determine Young’s modulus of elasticity of the material of a given wire
- To determine the internal resistance of a given primary cell using a potentiometer experiment
- To determine the coefficient of viscosity of given viscous liquid by measuring terminal velocity of given spherical body
- To determine specific heat capacity of given solid by method of mixtures
- To determine radius of curvature of a given spherical surface by a Spherometer
- Scope and Excitement of Physics
- Rocket science
- Relationship between frequency and length of wire under constant tension using Sonometer
- To determine equivalent resistance of resistors when connected in series and in parallel
- To convert the given galvanometer of known resistance and figure of merit into a voltmeter of desired range and to verify the same experiment
- To determine minimum deviation for given prism by plotting graph between angle of incidence and angle of deviation
- To compare the emf of two given primary cells using potentiometer experiment
Introduction
质心是指几何平衡的图形或物体。它是那个图形或物体的中心。找到对称实体中心的方法各不相同,但它是存在的,这一点没有混淆。
例如,三角形的质心是三个中间点的交汇点。与质心相比,重心是一个更广泛的术语,包括对称和非对称的物体和图形。值得注意的是,对称物体的重心和质心以及体积图形和形状都是相同的。对于不对称物体,我们需要进行加权距离分析,并通过将其除以总重量来找到平均值,以找到重心的距离。下图给出了我们如何理解这两个概念的想法
Fig:1 Centre of gravity of irregular stones and the Centroid of Trapezium
对于二维图形和体积图形,重心和质心往往是相同的,并且由于其提供的稳定性和平衡性,因此了解重心和质心很重要。在上图中,不规则石头的重心将向左移动,这是由于在逐一排列时呈现的倾斜以及石头的不规则形状。在梯形的情况下,一旦有了a、b和h,图中就给出了公式。本文明确了重心和质心的概念。就体积或质量物体的中心或稳定性而言,两者都是非常密切相关的术语,但在某些情况下有所不同。
Centre of Gravity (COG)
重心是物体中的假想点,地球引力通过该点作用于物体的物质质量以产生其重量。正是在这一点上,整个重量被集中起来,为该物体提供所需的稳定性。
方程重量=质量$mathrm{imes}$引力;W=mg值得一提。重心是指物体与参考点之间的距离。所以测量它的单位是米。
如果你以汽车的稳定性为例,你就会很好地理解重心的重要性。汽车、卡车和车辆有一个非常严格的设计阶段,制造商在满足所有其他要求的情况下,测试车辆的重心尽可能低。重心越低;车辆在道路上的稳定性越好。
Equation for Centre of Gravity
参考下图,杆的两端有两个重物——W1(5kg)作用于点A,W2(2kg)作用于点B。根据这种重量分布,重心作用于点G。
Fig:2 Find the center of gravity
图中标记了x1和x2距离,距离x(COG)的方程式为
$$mathrm{x=frac{(x_{1}W_{1}+x_{2}W_{2})}{(W_{1}+W_{2})}}$$
Relation between Centre of Gravity (COG) and Centre of Mass (COM)
重心是物体中的一个假想点,由于地球引力的作用,物体的重量向下作用。质心是物体物质中的一点,作用在物体上的外力会使物体沿外力预期的方向移动。
除了预期方向之外,没有其他因素与被确定为质心的点有关。在许多情况下,这两个因素都会汇聚到同一点。但两者并不总是一样的。COG由于重力而向下作用,而相反,COM沿外力的预期方向作用。
Practice Problems
Q1.找到长度为10m的直线的质心
Ans.线的质心为
$$mathrm{frac{L}{2}=frac{10}{2}=5:meter}$$
Q2.找到区域a的圆心
圆的圆心是半径r。
$$mathrm{A=pi r^{2};So:r=sqrt{frac{A}{pi }}}$$
Q3.找到长度为a、宽度为b的矩形的质心
Ans.矩形质心的X坐标为$mathrm{a/2}$,Y坐标为$mathrm{b/2}$
由于几何图形的质心或重心是基于几何原理的,请参考所有可能图形的公式,并提供良好的参考。
What is Centroid?
质心是指没有质量的几何图形,如圆形、三角形、正方形、梯形等。当考虑有质量和重量的物体时,使用的术语是重心。
Difference between Centre of Gravity and Centroid
S.NO | Characteristic | Centre Of Gravity | Centroid |
---|---|---|---|
1 | Direction of force | Vertically downwards | In the direction of external force |
2 | Main Criteria | Weight | Geometric Centre |
3 | Denoted By | Point G | Point C |
4 | Calculation / Measurement | By physical properties | By geometrical methods |
5 | Density | Variation in density within object allowed | Uniform density of the geometrical pattern or figure |
6 | Demonstration | Can be demonstrated with a physical matter of symmetrical or asymmetrical mass/density distribution | Can be demonstrated using geometrical concepts and vapdation of same. |
Conclusion
本文详细介绍了两个有趣的概念。两者的共同理念是对称和平衡的音调。每一个主题都从定义、核心概念、方程、与质心的关系、实践问题以及最后但并非最不重要的两个方面——质心和重心之间的差异——进行了探讨。有趣的是,这两种情况在大多数情况下都是一样的,比如体积形状和数字;它们是相同的,并且可以相互切换。对于具有质量的不对称材料,两者都是不同的。同样,对于有质量的对称材料,它们可以相互切换,因为它们在体物质中汇聚到同一点
常见问题
Q1.如何找到球体的质心
答案。如果考虑x-y-z坐标平面中的球体,并且其中心位于原点,则该球体的质心就是原点本身。如果从球体的表面拍摄,则距离曲面上任何点的距离为r(半径)
Q2.重心的单位是多少
答案。它是距离,因此单位是米
Q3.作战中的重心是什么
答案。重心是特定运营的多个中心中运营成本最低的中心
Q4。底盘连接电池的电动汽车会为汽车提供更好的稳定性吗
答案。是的,这是一个受欢迎的副作用。根据设计,电池最好放在地板上,以保护和节省空间。额外的好处是,这样可以降低车辆的重心,从而减少车辆侧翻和事故
Q5.什么是质量矩
答案。质量矩是质量和离一点距离的乘积。