Question

exam lesson name: energy conversions
exam number: 700697rr
exam guidelines
exam instructions
question 7 of 20 :
select the best answer for the question.

1. which force creates resistance between surfaces and means significant effort is needed just to make something move in all practical applications?

a. work force
b. friction
c. normal
d. horsepower
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Explanation:

To solve this, we analyze each option:

• Option A: "Work force" is not a standard term for a force creating surface resistance. Work is related to energy transfer, not a resistance force.
• Option B: Friction is the force that opposes motion between two surfaces in contact. It creates resistance, so significant effort is needed to move objects against it in practical applications.
• Option C: Normal force is the force perpendicular to a surface, supporting an object's weight, not a resistance to motion along the surface.
• Option D: Horsepower is a unit of power, not a force.

Answer:

B. Friction