circular motion uniform circular motion: examples include objects in orbit (earth around the...
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![Page 1: Circular Motion Uniform circular motion: examples include Objects in orbit (earth around the sunObjects in orbit (earth around the sun Driving a car around](https://reader036.vdocuments.us/reader036/viewer/2022082701/551579de55034674578b52e3/html5/thumbnails/1.jpg)
Circular MotionCircular Motion
Uniform circular motion: examples include Uniform circular motion: examples include •Objects in orbit (earth around the sunObjects in orbit (earth around the sun•Driving a car around a cornerDriving a car around a corner•Rotating a ball around on a stringRotating a ball around on a string
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Circular MotionCircular Motion
• According to Newton’s mechanics, objects don’t tend to move in a circle by themselves. They tend to either be at rest of move in a straight line at constant speed (this is Newton’s first law)
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Circular MotionCircular Motion
• Circular motion is not “natural” motion
• Some (a Force) must make an object move in a circle
• The Force causing circular motion can be one of many different forces, depends on the situation (orbit = gravitational force, car turning a corner = frictional force, ball on a string = tension force)
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Circular MotionCircular Motion
• Remember from Newton’s 2nd law, that …..Force = mass x acceleration (F = ma)
• But if the object is in uniform circular motion, their speed is constant, so is acceleration = 0?
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Circular MotionCircular Motion
• In circular motion, the acceleration is a change in the direction of the object, even though the speed is constant, the direction keeps changing, and velocity is a vector.
• The force keeps pulling the object to the center, hence we call this type of acceleration “centripetal” acceleration which means “center seeking”.
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Circular MotionCircular Motion
• Solving circular motion problems is like a typical “force” problem where the motion is circular rather than linear.
• F = ma still works, now we have a new term for centripetal acceleration
• ac = v2/r acceleration (centripetal) = velocity squared/radius.