Key words and definitions for Unit G481 (Mechanics) of OCR Physics A (AS Level). Created by Rob Cowen (https://www.youtube.com/cowenphysics).
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A boy of mass 60 kg is sledding down a 70 m slope starting from rest The slope is angled at
below the horizontal. After going 20 m along the slope, he passes his friend, who jumps on the sled. The friend has a mass of 50 kg, and the coefficient of kinetic friction between the sled and the snow is 0.12. Ignoring the mass of the sled, find their speed at the bottom.
The speed of sound in air as given in this chapter is an enormous speed compared to the speed of common objects. Yet the speed of sound is of the same order of magnitude as the rms speed of air molecules at 1 atmosphere and as given by the kinetic theory of gases. Is this just a remarkable coincidence? Explain.
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