This is a quote I like very much: “Great minds have purposes, others have wishes.” Washington Irving Now let’s have a purpose, learning 🙂 Every time we open a door, turn on a tap or tighten up a nut with a spanner, we exert a turning force. Two factors are involved here, 1- The magnitude […]
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science videos
Graham’s law of diffusion – Further illustration of surface tension
Graham’s law of diffusion The speed with which molecules move about inside a gas depends on their mass and temperature. Thus, at a given temperature the heavy molecules of carbon dioxide ” CO2″ move more slowly than the light molecules of hydrogen. This has an important bearing on the rate at which one gas will […]
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Archimedes’ principle: worked examples
Archimedes’ principle: worked examples 1. A ship of mass 1200 t floats in sea-water. What volume of sea-water does it displace?If the ship enters fresh water, what weight of cargo must be unloaded so that the same volume of water is displaced as before? ( Density of fresh water = 1000 kg/m³ , relative density […]
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Balloons and floating bodies
Balloons If a cork is held below the surface of water and then released it rises. The density of cork is less than that of water, so the weight of water displaced is greater than that of the cork itself. In accordance with Archimedes’ principle, the cork is acted upon by a resultant upward […]
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Newton’s law of universal gravitation vs Einstein’s principle of gravity
Gravitational force The force of which we are constantly aware in our daily lives is that which pulls us towards the earth. This is called gravitational force. Sir Isaac Newton came to the conclusion that gravitational force exists between all bodies. Thus, two stones are not only attracted towards the earth but also attract […]
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science-videos make physics easy
This video demonstrates Newton’s First law of motion : This video demonstrates Newton’s Second law of motion : This video demonstrates Newton’s Third law of motion : This video demonstrates : Special relativity Magnetic Fields Illustration.wmv
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