Vector Addition: Parallelogram Method Jerome walks 4 km north, and 8 km east. What is his displacement?
Graphical: Tip to Tail Method Jerome walks 4 km north, and 8 km east. What is his displacement?
Graphical Vector Addition: Parallelogram Method
Tip to Tail Method
Tip to Tail method D B A C R
Analytical vector addition 2km @ 75° 3km @ 20°
Analytical vector addition 2km @ 75° 3km @ 20°
3km @ 20° h = 3km cosθ = a/h sinθ = o/h therefore a = h cosθ therefore o = h sinθ a = 3 cos20° o = 3 sin20° a = 2.82km o = 1.03km
Analytical vector addition 2km @ 75° 3km @ 20° Vector addition table Vector mag Angle X Comp’t Y Comp’t 1 3 20 2.82 1.03 2 75 Res’t .52 1.93 3.34 2.96
Analytical vector addition Vector addition table Vector mag Angle X Comp’t Y Comp’t 1 3 20 2.82 1.03 2 75 Res’t R2 = x2 + y2 R2 = 3.342 + 2.962 R = 4.46 km .52 1.93 4.46 3.34 2.96
Analytical vector addition Vector addition table Vector mag Angle X Comp’t Y Comp’t 1 3 20 2.82 1.03 2 75 Res’t tanθ = opp/adj θ = tan-1(y/x) θ = tan-1(2.96/3.34) θ = 41.5˚ .52 1.93 4.46 41.5˚ 3.34 2.96