Question

Two identical hockey pucks are moving on a hockey rink at the same speed of 3 m/s and in perpendicular directions when they strike each other as shown. Assuming a coefficient of restitution e=0.7, determine the magnitude and direction of the velocity of each puck after Impact YB 2001 m/s The velocity of puck A after Impact, V'AIS The velocity of puck Bafter Impact, 'gis m/s

Answer 1

Solution : Using Principle of Impulse momentum: Emy+EMP.>> Emv m(Vélt t 120 n milt 20 * B RAT + B - (RAT А m (VA)n = m CVbt n- t-direction for Puck A -MVA Sin 20 to= m (VA'Dt (Valt VA Sin 20° = 35kn 26= 1.0261m/s t-direction for Puck B -MVB CB20° to (vb)t Ve los 20° = - 3 Cos 20° = -2.8191 m 15 direction both pucks MVA Cos 20° MVB Sin 20 = m (VA)n + m (VB)n (Vánt Velo = VA 68200 - Ve Sin 20 = 36820 - 35in 20° 0 Coefficient of Restitution e=0.7 Vis) - CV'nin e [An- (Vah] sohning and ② = 0.7 [310820 – (-3) sim 200 - 0 VA)n = -0.4493 m/s [(VB) n = 2.2423m/s = 1.12016 m/s VA= √ (0.4493 ) + (1.0261)2 tan L = 1.0261 L=66.352 0.4493

3.602 m/s 2:2423 n ** VA = 1./2016 m/s 7 86.3° VB = 12:242342 + (2.814139 tan B= 2.8191 B = 5150 2.2423 ** N'B = 3. 662 m/s - 3.662 m/s 231.5° B t 120 0 4993 26 n 1.2261 2:8191 Velocity of Buck Velocity of Puck B