What is the force that makes a ball fall to the ground? A. Magnetic force B. Gravitational force C. Electrical force D. Frictional force 相关知识点: 试题来源: 解析 B。解析:球落到地面是因为重力的作用。选项 A 磁力通常作用于磁性物体之间;选项 C 电力作用于带有电荷的物体之间;选项 D 摩擦力...
Force is everywhere and it comes in a variety of sizes, directions, and type. We can define Force as the push or pull of an object. Learn Force definition, unit & types of Force with solved examples.
C. Magnetic force. D. Frictional force. 相关知识点: 试题来源: 解析 B。解析:文章中提到“When an object is placed in water, it experiences an upward force called buoyant force. If the buoyant force is greater than the weight of the object, the object will float.”,所以使物体漂浮的力是...
What is the force that keeps the planets in orbit around the sun? A. Gravity B. Magnetic force C. Electrical force D. Friction 相关知识点: 试题来源: 解析 A。引力使行星围绕太阳运行。选项 B 磁力不是使行星围绕太阳运行的力。选项 C 电力不是使行星围绕太阳运行的力。选项 D 摩擦力不是使行星...
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...
Action-at-a-distance forcesinclude: gravitation, electrostatic and magnetic forces. Measuring Force: Force is measured using either the English System of Measurements or theInternational System of Units (SI). Common Units of Force --->>SI: Newton (N) 1 N = 0.225 lb; ...
Magnetomotive force is the work that carries a measurable unit of strength through a magnetic circuit. It plays an important role...
Physics - Classical PhysicsWe show that attempts to modify the force on a magnetic dipole by introducing either hidden momentum or internal forces are not correct. The standard textbook result ${\\\bf F=abla(\\\bmu\\\cdot B)}$ is correct even in the presence of time dependent electromagne...
What is Magnetomotive Force (MMF) - The Magnetomotive force (MMF) is defined as the work done in moving a unit magnetic pole once around the magnetic circuit. It is a magnetic pressure that tends to set up magnetic flux in a magnetic circuit. Mathematica
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...