c. Δp = m(v-u) 1 = 60 (0 – 16) 1 = - 960 N m s-1 1 d. when passengers collide with dashboard their momentum changes rapidly to zero. 1 The padding increases the time it takes for the passenger to stop 1 Since Ft = Δp, 1 If t increases, the force acting on passengers decreases causing fewer 1 injuries. Total /17 a. Ep = mgh 1 4 = 200 x 9.8 x 30 1 = 58 800 J 1 1 b. Ep converts to Ek, 1 so Ek = ½ mv2 = 58800 J 1 v2 = 58800 x 2 / 200 1 v = 24.3 m s-1 1 c. P = W / t = Ep / t 1 = 58800/24 1 = 2450 W 1 Total /11 Test total /49
c. Δp = m(v-u) = 60 (0 – 16) = - 960 N m s-1 1 1 1 d. when passengers collide with dashboard their momentum changes rapidly to zero. The padding increases the time it takes for the passenger to stop Since Ft = Δp, If t increases, the force acting on passengers decreases causing fewer injuries. 1 1 1 1 Total /17 4 a. Ep = mgh = 200 x 9.8 x 30 = 58 800 J 1 1 1 1 b. Ep converts to Ek, so Ek = ½ mv2 = 58800 J v2 = 58800 x 2 / 200 v = 24.3 m s-1 1 1 1 1 c. P = W / t = Ep / t = 58800/24 = 2450 W 1 1 1 Total /11 Test total /49
Physics_ATAR_Y11_sample_assessment_tasks_WACE_201516.docx