What do you mean by zero work, positive work and negative work?

Content Curator

In physics, work is defined as the energy transferred to or from an object by means of a force acting on the object. It is expressed mathematically as the product of the force and the displacement of the object in the direction of the force.

When the force acting on an object is perpendicular to the displacement of the object, the work done by the force is zero. In other words, no energy is transferred to or from the object in this case.
If the force and the displacement of the object are in the same direction, the work done by the force is positive. This means that energy is transferred to the object by the force, and the object gains energy.
If the force and the displacement of the object are in opposite directions, the work done by the force is negative. This means that energy is transferred from the object to the force, and the object loses energy.

In summary, zero work means that no energy is transferred to or from the object, positive work means that energy is transferred to the object, and negative work means that energy is transferred from the object.

zero work, positive work and negative work

Zero Work, Positive Work and Negative Work

Previous Year Questions

Calculate the work done by the applied force. [DUET 2011]
What is the work done to pull the hanging part on the table. [JIPMER 2000]
What is the work done in taking charge Q once along the loop? [NEET 2005]
The work done by a given force only depends on? [JKCET 2018]
Find the unknown angle between the force and displacement vector. [AMUEEE 2011]

Also check:

Relevant Concepts
Difference between Work & Power	Conservative Force	Work, Energy, and Power Formula
Mass and Momentum	Derivation of Kinetic Energy	Difference Between Force and Pressure
Rotational Kinetic Energy	Momentum and Inertia	Distance and Displacement

CBSE CLASS XII Related Questions

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

View Solution

3.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

$ (M_x - M_z)<M_y $
$ (M_x - M_y)<M_z $
$ M_x>(M_y + M_z) $
$ M_x<(M_y + M_z) $

View Solution

4.
An astronomical telescope consists of two converging lenses. One of them of large aperture and large focal length is called objective lens and the other one, of smaller focal length and smaller aperture is called the eyepiece. It is used to see distant objects which are not seen clearly with naked eyes. The image formed by the objective lens acts as an object for the eyepiece and the final image produced by the eyepiece is magnified.

5.
An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.

View Solution

6.
Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.

View Solution

What do you mean by zero work, positive work and negative work?

Previous Year Questions

CBSE CLASS XII Related Questions

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

3.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

What do you mean by zero work, positive work and negative work?

Previous Year Questions

CBSE CLASS XII Related Questions

1.A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

3.Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

3.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?