# A farmer hitches her tractor to a sled loaded with firewood and pulls it a distance of 20 m along...

## Question:

A farmer hitches her tractor to a sled loaded with firewood and pulls it a distance of 20 m along level ground. The total weight of sled and load is 14,7000 N. The tractor exerts a constant 5000 N force at an angle of 36.9 degrees above the horizontal. A 3500 N friction force opposes the sled's motion. Find the work done by all the forces.

## Work

The work produced by a force vector is defined as the dot multiplication of the force vector and the displacement vector. The dot multiplication or dot product produces a scalar quantity, hence work is also a scalar quantity.

## Answer and Explanation:

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**Given data:**

- The displacement is: {eq}s = 20\;{\rm{m}} {/eq}

- The friction force is: {eq}f = 3500\;{\rm{N}} {/eq}

- The net weight is: {eq}w =...

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Chapter 8 / Lesson 3Pushing a wall all day may feel like work, but unless you get that wall moving you're not doing any work according to the rules of physics. In this video lesson, you'll learn how work is defined as well as how to calculate the amount of work done on an object.