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Orbital Eccentricity

Planets, asteroids, and comets don’t travel around the sun in perfect circles. Their orbits are stretched out into a shape called an ellipse. The sun, rather sitting right in the center of the shape f ...

Magnetic Linear Accelerator

Have you ever seen one of those roller coasters that shoots out of the station at an insanely high speed? These roller coasters don’t need to climb hills first to use gravitational potential energy—th ...

Conservation of Linear Momentum and Newton's Third Law

If space is a vacuum—that is, if it contains absolutely nothing—then how does a rocket move? Doesn’t it need something to push against?Rockets can propel themselves through the nothingness of space be ...

Simple Harmonic Motion: Pendulum

The movement of a pendulum is called simple harmonic motion: when moved from a starting position, the pendulum feels a restoring force proportional to how far it’s been moved. Put another way, it alwa ...

Barycenter

Hipervinculo Física

Barycenter

You may have learned that the Moon goes around the Earth and the Earth goes around the Sun. But that’s not quite right. Strictly speaking, the Moon and Earth orbit each other.The barycenter is the poi ...

Atwood Machine and Newton’s 2nd Law

An Atwood Machine is a very simple device invented by George Atwood in 1794 as a way to demonstrate Newton’s Laws of Motion. Newton’s Second Law of Motion says that the force required to move somethin ...

Conservation of Energy Demonstration

Ever notice that a conventional roller coaster never goes higher than its first hill? Roller coasters always have to end lower than where they started because of a fundamental idea called the conserva ...

Horizontal and Vertical Motion

A bullet is fired from a gun held parallel to the ground. At the exact same moment, a second bullet is dropped from the same height as the gun. Which bullet hits the ground first?The answer to this cl ...

Factors Affecting Friction

Friction is kind of a drag. Every time you push on something, friction pushes back. To get an object moving, you have to overcome the friction force first. If you’ve ever walked on pavement and sudden ...

Apparent Weightlessness in an Elevator

Astronauts have to contend with a number of unusual issues while living on the space station. Possibly the biggest difference between life up there and life down here is the apparent “weightlessness”: ...

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