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Why do astronauts appear weightless despite being near the Earth?
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Basics of gravity and the Law of Universal Gravitation.
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This unit is about how things move along a straight line or, more scientifically, how things move in one dimension. Examples of this would be the movement (motion) of cars along a straight road or of trains along straight railway tracks.
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This YouTube video explains how river basins are formed.
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Speed necessary for the space station to stay in orbit.
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This YouTube documentary highlights the ecological and socio-economic importance of the Tana River Basin in Kenya.
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Viewing g as the value of Earth's gravitational field near the surface rather than the acceleration due to gravity near Earth's surface for an object in freefall.
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Introduction to viruses
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This 32 minute long YouTube video investigates the water contamination problems in Tanzania, with specific focus on Dar Es Salaam.