a) Net work:
Wnet = ΔKE
Wnet = F•d = fk•Δd = μkmgΔd
μkmgΔd = KEi - KEf
μkmgΔd = (1/2)mv02 - (1/2)mvf2
Suppose that the coefficient of kinetic friction between Zak's feet and the floor, while wearing socks, is 0.250. Knowing this, Zak decides to get a running start and then slide across the floor.
a) If Zak's speed is 3.00 when he starts to slide, what distance will he slide before stopping? d=1.84
b) Now, suppose that Zak's younger cousin, Greta, sees him sliding and takes off her shoes so that she can slide as well (assume her socks have the same coefficient of kinetic friction as Zak's). Instead of getting a running start, she asks Zak to give her a push. So, Zak pushes her with a force of 125 over a distance of 1.00 . If her mass is 20.0 , what distance does she slide after Zak's push ends? Remember that the frictional force acts on Greta during Zak's push and while she is sliding after the push.
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Kinetic Friction concept. You can view video lessons to learn Kinetic Friction. Or if you need more Kinetic Friction practice, you can also practice Kinetic Friction practice problems.
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Based on our data, we think this problem is relevant for Professor Becker's class at TAMU.