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Lesson_2.3_Homework

# Lesson_2.3_Homework - Lesson 8 Homework 1 A 50-kg crate is...

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Lesson 8 Homework 1. A 50-kg crate is at rest on a level surface. If the coefficient of static friction between the crate and the surface is 0.72, what horizontal force is required to move the crate? 2. A horizontal force of 40 N is required to move a 10-kg crate on a level surface. (i) What is the coefficient of static friction between the surface and the crate? (ii) Once the crate is set in motion, only a force of 35 N is required to keep it moving uniformly. What is the coefficient of kinetic friction between the two surfaces? 3. A 10-kg block is placed on an inclined plane of inclination 37 o . (i) What is the force pulling the block down the plane? (ii) What is the minimum force required to pull the block up the plane without acceleration? (iii) If the angle of inclination is increased to 42 o , the block begins to slide down without acceleration. What is the coefficient of kinetic friction between the block and the surface? 4

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Lesson_2.3_Homework - Lesson 8 Homework 1 A 50-kg crate is...

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