Arkansas-Little Rock-PHYS 2321-Spring18-CHEN Activities and Due Dates > Hw: Pote

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Arkansas-Little Rock-PHYS 2321-Spring18-CHEN Activities and Due Dates > Hw: Potential Energy and Conservation 3/25/2018 06:00 PM/100 4 Gradebook Question 3 o8 Mapn Sapling Learning A 2-kg toy car sits at the highest point of a 13-meter-high hilt The car is gently pushed forward untili begins to roll down the slope. Assuming the car coasts freely, without much kinetic energy (KE) and potential energy (PE) wit it have at each of the indicated points? Complete the diagram by plaing the correct label in each bin. Use for the acceleration due to gravity. g- 10 m/s2 Note, the diagram below is not drawn to scale or air resistance, how PE- KE-03 PE- PE KE KE- PE-es 6m KE- web and Windows

Explanation / Answer

Point 1 is highest and point 4 is lowest

At point 1

KE = 0 J

PE = m*g*h = 2*10*13 = 260 J

At point 2

PE = m*g*h2 = 2*10*2 = 40 J

from energy conservation at Point 1 and 2

PE1 + KE1 = PE2 + KE2

260 + 0 = 40 + KE2

KE2 = 220 J

At point 3

PE = m*g*h = 2*10*6 = 120 J

from energy conservation at Point 1 and 3

PE1 + KE1 = PE3 + KE3

260 + 0 = 120 + KE3

KE3 = 140 J

At point 4

PE4 = 0 J

from energy conservation at Point 1 and 4

PE1 + KE1 = PE4 + KE4

260 + 0 = 0 + KE4

KE4 = 260 J

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