Non-Contact force

A non-contact force is a force that acts on an object without coming physically in contact with it. Gravity is the most familiar non-contact force, which confers weight. In contrast, a contact force is a force applied to a body by another body that is in contact with it or in other words, Forces that arise without the contact of 2 or more objects involved. The types of non-contact forces are:

• Gravitational Force
• Magnetic Force
• Electrostatic Force
• Nuclear Force

Gravitational Force

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matters. All bodies have a weight on Earth, or downward force of gravity, proportional to their masses. Gravity is measured by the acceleration that it gives to freely falling objects. In other words, Gravitational force is a force exerted by the earth on all objects on it. Gravitational Force surrounds us everywhere we are. It is present when we are sitting, playing, walking, throwing, and everywhere. Not only Earth but any other massive celestial body exerts a gravitational pull. It can be greater or equal to or lesser than Earth’s gravitational force, but it is present to some extent. Since the bodies with a greater mass attract everything towards us hence there is a gravitational pull on anywhere we are on if it has a mass much greater than our weight.

Example of Gravitational Force

• When a ball is thrown up, it falls to the ground because of gravitational force.
• Water always flows downwards because of gravitational force.
• When we throw an apple up it comes down because of gravitational force.
• Any fruit falls in a downward direction always it is also due to gravitational force.

Gravitational Force Formula

It is denoted by the equation,

F = G(m₁m₂)/r²

where,

• F is Gravitational Force
• G is Universal Gravitational Constant
• m₁ and m₂ are masses of two Bodies
• r is the distance between Two Masses

Magnetic force

Attraction or repulsion that arises between electrically charged particles because of their motion is called magnetic force. The magnetic force is a consequence of electromagnetism, one of the four fundamental forces of nature, and is caused by the motion of charges.  In simple words, two objects containing charge with the same direction of motion have a magnetic attraction force between them. If the two objects have opposite charges then they repel each other.

Magnetic Force Formula

It is calculated by the given formula,

F = qVB sin θ

where,

• F is the Magnetic Force
• q is the Charge of Moving Particle
• B is Magnetic Field
• θ is angle between Velocity and Magnetic Field Vectors

Electrostatic Force

The force caused due to electric charges in an attractive and repulsive manner between the particles is called electrostatic force. The force between stationary charged bodies is conventionally known as the electrostatic force. It is also referred to as Columba’s force. In simple words, Electrostatic force is the force that exists between electrically charged particles or objects at rest.

Examples of Electrostatic Forces

Various examples of the electrostatic force are,

• When we rub a small paper piece with the oil in our head with the help of a comb it attracts the paper as shown in the image added below, this is because of the electrostatic force.

• Balloons always get attracted towards another balloon when one of them is rubbed with hair.
• When we iron silk clothes they often cling together after some time due to electrostatic charges.
• Lightning is also considered an example of electrostatic force.

Electrostatic Force Formula

Electrostatics force is calculated by using the formula,

F = k (q₁q₂)/r²

where,

• F is the Electrostatic Force of Attraction
• k is Constant of Proportionality
• q₁ and q₂ are the charges of two Bodies
• d is the distance between the two Bodies

Nuclear Force

The Force experienced inside the nucleus of an atom is called the nuclear force and this force is only attractive in nature. This force is responsible for binding the protons and neutrons of nucleus together. They are one of the strongest force in the universe.

Weak Forces

Forces that are required for the decay of neutrons are called weak forces. The neutron in weak force decay into protons and emit a electron and a antineutrino. The weak force works in even a smaller distance such as 1/10 th distance of the diameter of proton.

Read More,

• Structure of Nucleus
• Fundamental Forces
• Nuclear Energy

Forces are an external cause that makes a body move, stop, and increase its velocity and other. There are various types of forces in physics and they are generally classified into two categories that are, Contact Force and Non Contact Force.

In general, we define a push and pull as a force, and force is required for the proper working of the cosmos. There is a force between the fundamental particles and also between the galaxies. All these types of forces are caused by various reasons and in this article, we will learn about the types of forces, examples, and others. Before starting with the types of force we must first learn What is force. We have to study types of forces in class 8.