Category Archives: How do things move without contact?

Fire in ZERO-G!!

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Three Right Hand Rules of Electromagnetism – Magnetic Force

Teaching electricity and magnetism is complicated by the challenge that the magnetic forces are perpendicular to the motion of the particles and currents.  This requires a three-dimensional perspective which can introduce a variable of a “wrong” direction.  To prevent errors, … Continue reading

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Veritasium – Why Are Astronauts Weightless?

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How Do Satellites Get & Stay in Orbit?

SciShow Space takes you into Low Earth Orbit to explain how artificial satellites get up there and stay there — at least for a while.

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Gravitational energy vs height

Open the embedded graph to change the value of h and calculate the gravitational potential energy / kg at different heights. Can you estimate the kinetic energy needed to escape the Earth’s gravitational field?

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Gravitational field strength graph

Investigate the value of g (m/s2) varying with distance (km) from the centre of the Earth.

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PhET – Gravity force lab

Visualize the gravitational force that two objects exert on each other. Adjust properties of the objects to see how changing the properties affects the gravitational attraction. (Choose the fullscreen option down the bottom right hand corner.) https://phet.colorado.edu/en/simulation/gravity-force-lab

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PhET – Gravity And Orbits

Move the sun, earth, moon and space station to see how it affects their gravitational forces and orbital paths. Visualize the sizes and distances between different heavenly bodies, and turn off gravity to see what would happen without it! (Choose … Continue reading

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What Is Gravity?

People have a lot of different ideas about what gravity is: a downward force that stops you from flying off into space, an attraction smaller objects experience towards larger objects, or a mutual attraction between all masses. It is the … Continue reading

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The Mystery of Gravity

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