This video is about the orbital mechanics of why it's so hard to crash into the sun - the energy it takes to get there is astoundingly high, compared with leaving the solar system.

This video is about the orbital mechanics of why it's so hard to crash into the sun - the energy it takes to get there is astoundingly high, compared with leaving the solar system.

Learn how astrophysicists use the orbital motion of a visible star—its speed and period—to infer the mass of its invisible companion, often a black hole, in a binary system.

Is dark matter real? What is dark matter made of?Axions, Wimps, Machos explained. (Part 2 will be "why dark matter may not be matter at all") One of the biggest questions in science is: What is the...

This video covers:

- What an orbi
t is
- Why objects orbit rather than flying off or being
sucked in
- Why we consider orbiting objects to be continuall
y accelerating
- Why objects with a smaller orbit h

ave to...

My solutions to Free Response Question #1 from the 2018 AP Physics 1 Exam. Also included are my reflections on how to get more points on the exam.

This Short Answer question also works as a part of the AP Physics C: Mechanics...

The video discusses the relationship between orbital speed, orbital radius, and orbital period of objects in space. It explains how to calculate orbital speed using an equation and provides examples such as calculating the orbital speed...

This video is a lecture presentation on orbits. It discusses how an object remains in orbit and what affects the orbital speed of an object. The presenter explains the role gravity plays in keeping celestial bodies in orbit and gives...

Field lines, potentials, equipotential lines and potential gradients – they sound similar but mean different things! With all these confusing terms, it would be much easier to kick back and watch some soccer (football). In fact, why...