# Assuming that the mass of the block is 200 g and the mass of the hanger is 120 g, what is the...

## Question:

Assuming that the mass of the block is 200 g and the mass of the hanger is 120 g, what is the coefficient of friction between the block and the lab bench? (Approximate the acceleration due to gravity as g=10m/s2)

## Weight and Frictional force

The weight {eq}(W) {/eq} of an object is the gravitational force acting on that object which is given by, {eq}W = mg {/eq}, where

- {eq}m {/eq} is the mass of the object

- {eq}g {/eq} is the acceleration due to gravity

The magnitude of force of friction {eq}(F_f) {/eq} on an object is given by, {eq}F_f = \mu N {/eq}, where

- {eq}N {/eq} is the normal reaction force on the object at the surface of the contact

- {eq}\mu {/eq} is the coefficient of friction.

## Answer and Explanation:

**Given :**

Mass of the block, {eq}m = 200\ g = 0.2\ kg {/eq}

Mass of hanger, {eq}M = 120\ g = 0.12\ kg {/eq}

Acceleration due to gravity, {eq}g =...

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from High School Physical Science: Help and Review

Chapter 11 / Lesson 21