Pendulum A string is attached to mass m and swung in a horizontal circle of radius r. There is tension T in the string. The angle θ is measured from the.

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Presentation transcript:

Pendulum A string is attached to mass m and swung in a horizontal circle of radius r. There is tension T in the string. The angle θ is measured from the vertical (where the string is held). On the free-body diagram there is no centripetal force indicated. It is not a separate force.

http://ngsir.netfirms.com/englishhtm/ConicalPendulum.htm

Can you derive … What is the Speed of a Conical (horizontal) Pendulum? q r What is the Speed of a Conical (horizontal) Pendulum? T mg Can you derive …

Easy method T mg ΣFc What is the Speed of a Conical (horizontal) Pendulum? q r Easy method T T q mg mg ΣFc

What is the Speed of a Conical Pendulum? q r T mg

A pendulum bob with mass of 1 A pendulum bob with mass of 1.5 kg whirls around in a horizontal circle at constant speed v at the end of a 1.7 m cord. The cord makes a 37°angle with the vertical. What is the bob’s speed? How long does it take it to make one revolution?

Flat Curve Friction is keeping the mass on the curve and is acting towards the center. The frictional force can be set equal to the centripetal force

‘Banked’ Curves (Uniform) Circular Motion… Can you derive …

Banked Curve?

Banked Curve A component of the Support / normal force is keeping the car on the curve. So the reliance on friction can be reduced with a banked curved. The horizontal component of the Support / normal force can be set equal to the centripetal force. The vertical component of the normal force offsets the weight.

Can you derive …

A car of mass m is moving at a constant speed of 20 m/s around a banked curve with 200 m radius. i) What angle is needed to make the reliance on tire friction unnecessary (or assume an extreme icy surface…) ? ii) the radius of the curve was 40m? 11o 45o

At the top of a roller coaster loop? What type of force is providing the centripetal force in the following examples…… Earth orbiting the sun? Moon orbiting the earth? Ball on a string? At the top of a roller coaster loop? A car on a circular track?