phyiscs2b

toc = definitions = circular motion - the movement of an object at constant speed around a circle with fixed radius axis - object turns around an internal axis rotation -object turns around an internal axis revolution -object turns around an external axis linear speed -distance/time rotational speed - speed along a circular path tangential speed - is a radial distance time the rotational speed V=rW centripetal force - force that causes an object to follow a circular path centripetal acceleration - always points towards the center of the circular motion period Newton and gravity - Isaac Newton believes that gravitation forces were responsable for the acceleration of objects on the moon and the earth Universal Gravitation, and mass - as the mass of either object or both objects increases, the force of gravitational attraction increases Universal Gravitation, and distance - as the distance seperating two objects increases, the force of attraction is exponentially smaller friction - is the force exerted on one surface by the other when the are in relative motion static friction force - exerted on one surface by the other when there is relative motion between the two surfaces apparent weight - the force exerted by the scale weightlessness no force pushing up the apparent weight is zero Coloumb's law - =n the relationship among electrical forces, charges, and distance. It is like Newtons law of gravity but, unlike gravity, electic forces can be attracted in the 18th centrey electric field - a vector quantity that relates the force exterted on a charge to the size of the change (the magnitude of the electric field is measuered in n/c(newtoncolounb)

= examples = circular motion - a race car making a turn in the race track circular motion - example: ice skater revolution - example: earth around the sun rotational speed - example: carousal horses travel at same rational speed but different tangential speed. centripetal force - example: force holdingnoccupants safely in a rotating carnival ride

= citations = "yahoo.com (videos)" "google.com (videos)"

= videos and pictures = circular motion newtons law of ubiversal gravity friction coulomb's laws electric fields  video of newtons laws of univesal gravitation media type="custom" key="7675371"