Presentation on theme: "Uniform circular motion: examples include"— Presentation transcript:
1 Uniform circular motion: examples include Objects in orbit (earth around the sunDriving a car around a cornerRotating a ball around on a string
2 Circular MotionAccording 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)
3 Circular Motion Circular motion is not “natural” motion Some (a Force) must make an object move in a circleThe 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)
4 Circular MotionRemember 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?
5 Circular MotionIn 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”.
6 Circular MotionSolving 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 accelerationac = v2/r acceleration (centripetal) = velocity squared/radius.