Circular Motion Rotation and Revolution What is an
- Slides: 16
Circular Motion
Rotation and Revolution What is an axis? The straight line around which a rotation takes place
Rotation and Revolution When the object turns around an internal axis (the axis is located within the body of the object)… the motion is called rotation http: //www. youtube. com /watch? v=9 Lz. Z 1 ORj. Sjk
Rotation and Revolution When an object turns around an external axis…. the motion is called a revolution
Rotation and Revolution Review
Review The Earth ______ around the sun once every ____. The Earth _____ around an axis (through it’s poles) once every _____. Revolves 365. 25 days Rotates 24 hours
Please define the following vocabulary words 1) axis gravity 2) centrifugal force 3) centripetal force 4) linear speed 5) revolution 6) rotation 7) rotational speed 8) tangential speed 9) center of 10) center of mass Vocab quiz Thursday
Review 1) Match the following terms: Orbit Revolve Spin Rotate Orbit → Revolve Spin → Rotate 2) Which object rotates and which revolves? Top? Moon? Rotates Revolves
Review Is it correct or incorrect to say that the Earth is rotating around the Sun? Why?
Rotational Speed Which moves faster, the outer horse on a merry go round or the inner horse?
Rotational Speed 2 parts 1) Linear Speed = Distance Time 2) Rotational Speed= Rotations Time
Review At the center of the axis, do you have linear or rotational speed? Rotational
Review As you move outward do you increase your linear or rotational speed? Linear
Review 1) Which part of the Earth’s surface has the greatest rotational speed? Linear speed? All parts have the same rotational speed The equator has the greatest linear speed
2) Trains ride on a pair of tracks. When traveling in a straight line, the tracks are the same length. But which track is longer for a curve, the on the outside on the inside curve?
Summary In a rigid rotating system, all parts have the same (rotational, linear) speed, but the (rotational, linear) speed varies. rotational, linear Linear speed depends on the _____ from the axis of rotation and on the _____ speed. distance, rotational