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Tamiku [17]
3 years ago
10

Emma is working in a shoe test lab measuring the coefficient of friction for tennis shoes on a variety of surfaces. The shoes ar

e pushed against the surface with a force of 400 N, and a sample of the surface material is then pulled out from under the shoe by a machine. The machine pulls with a force of 300 N before the material begins to slide. When the material is sliding, the machine has to pull with a force of only 200 N to keep the material moving.
a. What is the coefficient of static friction between the shoe and the material?
Physics
1 answer:
Soloha48 [4]3 years ago
5 0

Answer:

normal force in the vertical direction = 400 N

static friction = 300

uS*N = 300

uS * 400 = 300

us = 0.75

dynamic friction or kinetic friction = 200

uK * 400 = 200

uk = 0.5

a) 0.75 b) 0.5

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Answer:

IMA = 2.5 metres

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The AMA of a machine is referred to as the Actual Mechanical Advantage of a machine, calculated as the ratio of the output to the input force.

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From the diagram, the input distance which is also the distance moved by effort  = 5metres

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IMA = INPUT DISTANCE / OUTPUT DISTANCE

IMA = 5metres / 2 metres = 2.5 meters

Efficiency is the ratio of AMA TO IMA

AMA = 2, IMA = 2.5

EFFICIENCY = AMA / IMA

EFFICIENCY = (2 / 2.5) × 100%= 0.8 × 100%

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3 years ago
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