Author Archives: justin

Fire in ZERO-G!!

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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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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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Minute Physics – What is Gravity?

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RMS voltage & current video

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Transmitting electricity at low and high voltages video

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Transformers video

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