# Quick Answer: How Do You Calculate Work?

## What is the force of weight?

Weight is a force acting on that matter .

Mass resists any change in the motion of objects.

In physics, the term weight has a specific meaning – which is the force that acts on a mass due to gravity.

Weight is measured in newtons..

## Is normal force equal to weight?

The normal force is usually symbolized by N . In many cases the normal force is simply equal to the weight of an object, but that’s only when the normal force is the only thing counteracting the weight. … The normal force is the force that would be measured by a scale placed between the objects in contact.

## What is the formula for calculating energy efficiency?

Energy efficiency is calculated by dividing the energy obtained (useful energy or energy output) by the initial energy (energy input). For example, a refrigerator has an energy efficiency of 20 to 50%, an incandescent bulb about 5%, a LED lamp over 30%, and a wind turbine 59% at most.

## How do we calculate time?

To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

## How do you calculate the work done?

Calculate the work done moving the other team.work done = force × distance.work done = 1,000 N × 5 m.work done = 5,000 J (or 5 kJ)

## How do you calculate work on a calculator?

FormulaWork : W = Fd (work = force x distance)Force : F = W/d.Distance : d = W/F.Where, W =Work, F = Force, D = Distance.

## What is the efficiency formula?

Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.

## What is the equation for weight?

Weight is a measure of the force of gravity pulling down on an object. It depends on the object’s mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object’s weight in Newtons (N) and m is the object’s mass in kilograms.

## How do you calculate work and power?

Power equals work (J) divided by time (s). The SI unit for power is the watt (W), which equals 1 joule of work per second (J/s). Power may be measured in a unit called the horsepower.

## How does distance affect weight?

The weight W, or gravitational force, is then just the mass of an object times the gravitational acceleration. Since the gravitational constant (g) depends on the square of the distance from the center of the earth, the weight of an object decreases with altitude.

## How do we calculate energy?

In classical mechanics, kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

## What is efficiency and how is it calculated?

The efficiency formula is: (Work output ÷ Work input) x 100% = Efficiency. The work output in this definition is considered to be the useful amount of work output – that is, all scrap, spoilage, and waste is excluded from the numerator.