Refer to the diagram when answering the next three questions. Two hockey pucks a

Question

Refer to the diagram when answering the next three questions. Two hockey pucks are at rest on a frictionless horizontal table. The diagram is a top view. Puck 2 has our (4) times the mass of Puck 1. The pucks are pushed by two equal and constant forces that continue pushing all the way across the table to the finish line. Which puck will reach the finish j line first? 1 2 They will both reach the finish line at the same time. Too little information to answer. Which puck will have the greater I kinetic energy upon reaching the finish line? 1 2 They both have the same amount. Too little information to answer. Now suppose there is friction between the table and the pucks, and the pucks have the same coefficient of kinetic friction. Which puck will have the greater kinetic energy upon reaching the finish line? 1 2 They both have the same amount. Too little information to answer

Explanation / Answer

v = u + at

a1 = F/m1

a2 = F/m2

m1 = 4m1

a2 = F/4m1

a2 = a1/4

v = u + at

1 has more acceleration so 1 will reach first

part b )

v1^1 = 2a1s

v2^2 = 2a2*s = 2*a1/4*s

KE1 = m1*v1^2/2 = m1*2a1*s/2

KE2 = m2*v2^2/2 = 4m1*2*a1*s/2*4 = m1*2*a1*s/2

thet have same kinetic energy

part c )

Fnet = F -mu*m*g

a1 = (F-mu*m1*g)/m1

a2 = (F - mu*m2*g)/m1

a2 = (F - 4mu*m1*g)/4m1

1 will have more nergy

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