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Dimensions of Work 

Dimensions of Work 

When you are learning some chapters for your test, the work you have done can be calculated by the number of chapters you learned in a specific time or other parameters. When you receive a large Amazon parcel and have to carry it on a set of stairs, how will you calculate the work done to carry the parcel? What factors will decide the work you have done or the energy you have used to carry the parcel? 

Table of Contents

What is Work?

In the field of physics, work is an act that occurs when an applied force causes the motion of an object to be transferred. The work done is calculated by the product of force and displacement. The work done is the result of the measure of displacement and the amount of force acting in that direction.

Joule (J) is the SI unit of work, which can be defined as the amount of work done by the force equal to one Newton to displace an object by a metre in the chosen direction of the force.

The work done on an object is given by the formula

work = Fd

Where

F = force

d = displacement

Energy

Energy is the potential to do work. Energy can not be generated or destroyed; it can only be transformed from one state to another. The SI unit of energy is Joules. Energy exists in a variety of forms since it may be found in a diversity of materials. 

Energy is classified into two types: kinetic and potential. Motion is propelled by kinetic energy, whereas potential energy is the energy stored inside an object and is defined by the amount of effort needed to release it. 

Power

The rate through which work is completed and the total amount of energy used per unit of time is known as power. It is given by the formula

formula

Where

W = work 

t = time 

Dimensional Formula for Work

The definition and formula of the physical quantity, along with the known dimensions, must be taken into account to determine the dimensions of any physical quantity.

Work is measured as a scalar quantity. It is the scalar result of displacement and force. The force that was applied might or might not have been the factor that caused the object to move. 

The dimensional formula for work is given by 

[M1L2T-2]

Where 

M = mass

L = length

T = time 

We can derive the dimensions of work. 

Derivation for the Dimensions of Work

formula

The dimensions for displacement is given by 

displacement =[L1] ---------- (iii)

Put the value of equations (ii) and (iii) in equation (i)

formula

Practice Problems

Q1. What are the dimensions of work?

formula
formula

Ans. d. The dimensional formula for work can be written as formula

Q2. Which of the following physical quantities has the same unit as work? 

a. Force
b. Energy
c. Power 
d. Velocity

Ans. b. The SI unit of work is Joules. The SI unit of energy is the same as the SI unit of work.

Q3. Which of the following is a dimensionless physical quantity?

a. Work
b. Acceleration
c. Strain 
d. Force

Ans. c. Strain is a dimensionless physical quantity because it is the ratio of the change in dimensions of an object to the original dimensions of an object. 

FAQs

Q1. What is the difference between work and energy?
Ans.
Work is the transmission of energy over a specific distance in one direction with the help of a force. Energy is also known as the force that acts at a given distance.

Q2. What is the dimension of energy?
Ans. The dimensions of energy are given as [M1L2T-2].

Q3. What is 1 Newton of force?
Ans. The force that is needed to move one kilogram of mass at the rate of 1 m/s2 is called one Newton of force. 1N = 1kg m/s2.

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