Table of Contents

## How do you calculate the work done by friction on a block?

Well, in a simple way there are two cases to calculate the work done in the presence of friction.

- If the force parallel to the motion of the object: W = F.d , where d is the distance and F is the acted/applied force.
- On the other hand, if the force is acting not in parallel way(i.e with some angle θ), then: W = F.dcosθ

**What is the work done by force of friction when an object moves on a rough surface?**

Frictional force is always opposing the relative motion of the body. When a body is dragged along a rough surface, the frictional force will be acting in the direction opposite to the displacement. Thus, the work done by the frictional force will be negative.

### How much work does frictional force do?

Friction does negative work. Example 10: In Example 9, the work done by force of friction is -112,000J.

**What is the friction force on the block?**

The maximum friction force that can act on the block is given by fmax = muS*N, wheremuS is the coefficient of static friction. From these we see that the block will be in a state of impending slip when P = fmax = muS*N.

#### How much work is done on the crate by friction during this displacement?

The work done on the crate by friction during this displacement is -283.7 J. D. The normal force is perpendicular to the distance. The work done by the normal force is 0 J.

**How do you calculate work done by force?**

Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.

## Is work done by frictional force negative?

A work done by friction is always negative.

**Can work done by friction be zero?**

Since, the direction of motion of the block and the direction of frictional force is opposite to each other, the work done by friction is negative. The work done by friction can also be zero. Therefore, zero work is done by friction. Therefore, friction can do positive, negative as well as zero work.

### How do you calculate the average force of friction?

Calculation of average friction: For static frictional force, it increases linearly w.r.t applied force, so by taking the mean of the maximum value of friction with the minimum value you can get the average force of friction. Suppose, a mass of m was lying on a horizontal surface whose frictional coefficient is μ.

**In which direction is the static friction force on Block 1?**

Due to inertia block 1 wants to move backward to the left so there has to be a force of static friction on it that acts to the right in order for it to stay in place.