Basic Physics II Evidences - DrJJ - UiTM

1/22/2011PHY407Lecture 2: IntroductionActivity 2-Resultant Force• Break the forces into its x and ycomponents. Use trigonometry to find thevalues.• Then add up all the +ve & the –ve xcomponents to get the sum of forcesalong the x.• Add up all the +ve & the –ve ycomponents to get the sum of forcesalong the y.• Use Pythagoras theorem to determine themagnitude of the resultant force.• Use trigonometry to find the directionφ22xF = F + FFytan Φ =Fx2yCopyright DR JJ,FSG, UiTM 19PHY407Lecture 2: IntroductionActivity 1-Electrical (Coulomb) Force• Right electron pulls the proton tothe right.• Left electron pulls the proton tothe left with a smaller force thanthe electron on the right.• Top electron pulls the proton upwith the same force that the leftelectron exerts on the centralelectron.• Top left corner electron pulls theproton to the top left corner.Copyright DR JJ,FSG, UiTM 20Copyright DR JJ,FSG, UiTM; Jan08 10