单词	simple pendulum
释义	simple pendulum In a mathematical model, a simple pendulum is represented by a particle of mass m, suspended by a light string of constant length l from a fixed point. The particle, representing the bob of the pendulum, is free to move in a specified vertical plane through the point of suspension, acted on by gravity and tension in the string. Suppose the string makes an angle θ with the vertical at time t. The equation of motion is . When θ is small for all time, sin θ ≈ θ and the equation becomes , where ω2 = g/l. It follows that the pendulum performs approximately simple harmonic motion with period
随便看	power power power power series power set precision precision predator–prey equations predicate predicate logic predicted variable predictor variable prefix prefix code pre-image premultiplication presentation pressure primary decomposition theorem prime prime decomposition prime element prime ideal prime knot prime meridian

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