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Mass Resources

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Is Mass Weight? Written by tutor R Bruce N. There is a lot of confusion between the terms - mass and weight. Somebody asks, “How much do you weigh?” and you say, “I weigh 75 kilograms.” Really? We use the term weight when really we mean “mass”. Mass is the amount of material in an object and has no relation to its weight. Weight depends on gravity, and gravity depends... read more

Lessons

Center of Mass Written by tutor Nilay S. When calculating trajectories and collisions, it’s convenient to treat extended bodies, such as boxes and balls, as point masses. This allows us to use free-body diagrams for objects with different shapes and sizes while taking into account their masses and trajectories. We can treat objects, and even systems (Say galaxies in case of inter-galactic... read more