![]() ![]() When things move in circular motion they are changing direction constantly. (They are actually elliptical orbits in real life but ignore this for this topic) These are all examples of circular motion. Or when Earth orbits the sun, or when the moon orbits the Earth. For example, when a car goes around a corner, it is undergoing circular motion. What's important here is that the distance between the body and the 'point' remains constant during the curve. Uniform circular motion: Object with circular trajectory and constant angular velocity.Ĭircular motion is the type of motion that is undergone when a body curves around some 'point'. What are the characteristics of circular motion? Since the circumference is given by l = θ × r The linear velocity is V = ω r (ms -1) Symbol = VĪn object spinning can have a linear speed based on the distance a point on the circumference or an angular speed based on the angle. ![]() Linear speed: Change in distance of a point on the circumference per second. For example, think of the rpm, (revolutions per minute) of engines, and the periods of planets in the Solar System expressed in years.Īngular velocity: Change in angle per second. Note that we often encounter different units when discussing the circular motion. These two variables are related through f = 1 / T. Remember $$1Hz=1s^−1$$, or one revolution per second. The frequency, f, as the number of revolutions per second (hertz, Hz).The period, T, as the time taken to complete one revolution (seconds, s).Circular motion Characteristics of Circular Motionįor an object in circular motion we define: ![]()
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