test+reveiw

Circular motion notes

V=r w Centripetal force
 * the motion of an object at constant speed around a circle with fixed radius
 * Axis- striaght line around with rotation takes places
 * rotation- object turn around internal axis
 * revoultion- object turn around an external axs
 * liner speed- distance/ time
 * trangential speed- speed along a circular path.
 * rotational speed- number of rotations per unit of time
 * trangential speed is a radial speed

Fnet=__mv^2__ r Centrpetal Acceleration other formulas
 * force that causes an object to follow a circular path
 * Always points toward the center of circular motion.
 * period (t)= time needed for an object to make one complete revolution
 * distance traveled= circumference
 * circumference=2(pie)r=(pie) d
 * Ac=v^2/r
 * the umber o frevolution equals distance & circumference
 * Revolution=mdistance/ circumference
 * tension is force

Newton and gravity

Issac Newton believed that graviton force were responsible for the acceleration of objects on moon and earth. Suppose we fire a cannon horizontally from a high mountain the projectile will eventually fall to the earth cannon ball with exactly the right velocity, the projectile would travel completely around the earth always falling into gravitation field but never reaching the earth.

Newton concluded that any two objects in the universe exert gravitation attraction on each other Newtons law of universal gravitation applies to all objects Universal gravitational and mass As the mass of either object or both object increase the force of gravitational attraction increases Universal gravitation and distance As the distance separating two objects increase the force of attraction is exopentially smaller.

Functions When writing it its friction Friction is also when erase mistakes Air darg Is with friction M mue If an object is flowing kinetic is flowing Static friction object does not move Also static friction can change Static little because newtons first law and always bigger

** Coulomb law/ Electic fields notes **

Coulomb laws=relationship among electrical force charges & distance It is like newtons aw of gravity but unlike gravity electric force can be attracted or repulsive Discovered by French scientist charles coloumb 18th century coloumbs laws F=KqAqb/d2 F=force (n) K- electrical proportionality Constant = 9.0* 10^9N*m^2 q=charge(c for coulomb) d=distance(m) Impoatant information > · Q is not a vector quantity > · Therefore, when described as positive or negative that tells if it is a proton or electron but not part of the charge > · DO NOT PUT NEGATIVE IN THE FORMULA > · Electric fields –a vector quantity that relates the force exerted on a charge to the size of the charge > · The magnitude of the electric field is measured in N/C (Newton/coulomb) > · Direction of arrows indicate the change of the field > · Away from a positive charged objects > · Toward a negatively charged object > Work (j) v=potential difference (v) q= test charge (c) > Grounding-touching a body to earth to climate excess charge > Electric current- flow of charged particles q=charge(c for coulomb) d=distance(m) Important information  · charge of 1 protons is +1.6*10 -19 c  · charge of 1 electron is -1.6*10 -19c  · Q is not a vector quantity  · Therefore, when described as positive or negative that tells if it is a proton or electron but not part of the charge  · DO NOT PUT NEGATIVE IN THE FORMULA  · Electric fields –a vector quantity that relates the force exerted on a charge to the size of the charge  · The magnitude of the electric field is measured in N/C (Newton/coulomb)  · Direction of arrows indicate the change of the field  · Away from a positive charged objects  · Toward a negatively charged object Work (j) v=potential difference (v) q= test charge (c) Grounding-touching a body to earth to climate excess charge Electric current- flow of charged particles
 * the si unit o fmeasure for electral charge is a coulomb(c)
 * charge of 1 protons
 * · charge of 1 electron is -1.6*10 -19c
 *  the si unit of measure for electrical charge is a coulomb(c)