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Roller Coasters 🎢 | Weird But True! | S1 E12 | Full Episode | Nat Geo Kids

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Science Trek
A force is basically a push or a pull. Forces like gravity, inertia, and momentum affect everything. On this Science Trek, host Joan Cartan-Hansen and her guest scientists, John Gardner, a professor of mechanical engineering at Boise State University and Kathryn Devine, Assistant Professor of Physics at the College of Idaho, will answer students' questions about force and motion.

Aired: 03/14/16

Rating: TV-G

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Why do things fall? It's about force and motion. Find out more in this Science Trek short.

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Science Trek | Force and Motion Video Short

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Find out more about Sir Isaac Newton's laws of force and motion.

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Electromagnetism 101 | National Geographic

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Electromagnetic force - Energy Education

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The electromagnetic force, also called the Lorentz force, explains how both moving and stationary charged particles interact. It’s called the electromagnetic force because it includes the formerly distinct electric force and the magnetic force; magnetic forces and electric forces are really the same fundamental force.[1] The electromagnetic force is one of the four fundamental forces.

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Table of Contents

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mechanical energy, sum of the kinetic energy, or energy of motion, and the potential energy, or energy stored in a system by reason of the position of its parts. Mechanical energy is constant in a system that has only gravitational forces or in an otherwise idealized system-that is, one lacking dissipative forces, such as friction and air resistance, or one in which such forces can be reasonably neglected. Thus, a swinging pendulum has its greatest kinetic energy and least potential energy in the vertical position, in which its speed is greatest and its height least; it has its least kinetic energy and greatest potential energy at the extremities of its swing, in which its speed is zero and its height is greatest. As the pendulum moves, energy is continuously passing back and forth between the two forms. Neglecting friction at the pivot and air resistance, the sum of the kinetic and potential energies of the pendulum, or its mechanical energy, is constant. Actually the mechanical energy of the system is diminished at the end of each swing by the tiny amount of energy transferred out of the system by the work done by the pendulum in opposition to the forces of friction and air resistance. The mechanical energy of the Earth- Moon system is nearly constant as it is rhythmically interchanged between its kinetic and potential forms. When the Moon is farthest from Earth in its nearly elliptical orbit, its speed is least. Its kinetic energy has become least, and its potential energy is greatest. When the Moon is closest to Earth, it travels fastest; some potential energy has been converted to kinetic energy.

The Editors of Encyclopaedia Britannica Adam Augustyn.

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Mechanical energy | Definition, Examples, & Facts

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mechanical energy, sum of the kinetic energy, or energy of motion, and the potential energy, or energy stored in a system by reason of the position of its parts. Mechanical energy is constant in a system that has only gravitational forces or in an otherwise idealized system-that is, one lacking dissipative forces, such as friction and air resistance, or one in which such forces can be reasonably neglected.