According to Newton's law of gravitation, the sun should "pull" way harder on the moon than the Earth does. So does the moon actually orbit the Earth? Why?

Mr. Andersen contrasts nuclear reactions to chemical reactions. He explains the four main forces of nature; including gravity, electromagnetism, strong, and weak nuclear forces. He also explains how fusion differs from fission.

In this video Paul Andersen explains how the gravitational field strength is directly related to the mass of the object and indirectly related to the square of the distance from the center of mass. The equation for gravitational field...

Forces are pushes or pulls on an object. Forces can be determined by measuring the motion of an object. If an object accelerates then a force is present.

In this episode, we discuss the basic nature of gravity, one of the four fundamental forces in our universe.

So, if gravity pulls everything down, then why don't things on the bottom of the Earth get pulled down into space? In this episode of Crash Course Kids, Sabrina talks about gravity and explains that when we talk about gravity pulling...

New ReviewIn this lesson, we compare electric potential energy and gravitational potential energy for a proton moving between parallel plates in a uniform electric field, and we plug in realistic values to show just how small the gravitational...

New ReviewIn this lesson we derive the change in gravitational potential energy for an object moving in a uniform gravitational field and then use that result as a direct analogy to determine the change in electric potential energy for a charge...

New ReviewThis colorful video program takes a look at the many different types of forces. Magnetic, electric, and gravitational forces are all explored. Special emphasis highlights how these forces impact our everyday lives. This video correlates...

Explore the physics of a double-star system: calculate the angular speed of two orbiting stars and determine the minimum escape speed a meteoroid needs to flee the gravitational pull from the center of mass.

A neutron star spinning at 1 revolution per second is on the edge of tearing itself apart. This lesson breaks down the physics of rotational stability, showing how gravity and circular motion determine the star's minimum mass.

Learn how to calculate gravitational attraction between a point mass and a uniform rod using integration and Newton’s law of universal gravitation—essential for advanced physics students.

if you took a notebook, a plastic bottle, a toaster, and a glass container and burned them in a fire hot enough, around 10^31 degrees Celsius, all the particles and forces, would become one entity. This is what...

AdS/CFT suggests that our three-dimensional universe can be perfectly modeled by a two-dimensional surface. On one side is AdS, or Anti-de Sitter space, which is a kind of imaginary universe with some unusual properties...

Discover the true meaning behind the gravitational potential energy formula U = –GMm/r. Learn how it explains bound systems, escape energy, and why gravitational energy is always negative — all through clear, intuitive reasoning.

Explore what happens if you fall straight through Earth—using Newton’s Shell Theorem, simple harmonic motion, and real gravitational data. Understand why every straight tunnel gives the same 42-minute trip, and how gravity behaves inside...

Discover how gravitational acceleration is calculated near Earth and why your weight changes with altitude, latitude, and Earth’s rotation. This lesson unpacks the physics behind g = a₉ − ω²R and shows how gravity subtly varies across...

Learn how to calculate gravitational force on a particle due to multiple masses using the principle of superposition. This lesson breaks down vector addition, force from extended bodies using integrals, and how to apply Newton’s law of...

Master Newton’s law of universal gravitation through intuitive explanations, real-world examples, and full vector analysis. Learn how to calculate gravitational force, understand the inverse square law, and apply Newton’s third law in...

Pupil outcome: I can clearly describe how drag forces affect the motion of falling objects. Key learning points: - The gravitational force on a falling object is constant. - The drag force on a falling obejct depends on its speed and...

This content explains how to determine the masses of three connected boxes hanging in equilibrium by applying Newton's Second Law of Motion. Learn to use free body diagrams and tension forces to solve for unknown masses in a stationary...

This content delves into analyzing forces on an inclined plane, focusing on static and kinetic friction to control the motion of a box. Learn to calculate forces needed to prevent slipping, initiate upward movement, and maintain constant...

This content explains how to calculate the normal force on a box inside an accelerating elevator system using Newton's Laws of Motion. It details how to first determine the system's acceleration from the forces on one cab, then apply...

This content outlines a structured approach to solving a physics problem involving a chain of five links being lifted vertically with constant acceleration. It emphasizes the combined application of Newton's Second and Third Laws of...