Contact Force

A contact force is any force that requires a contact to occur or in simple words, we can say that it arises during the motion of one object over the surface of another. Contact forces are generated only when in contact and are responsible for the most visible actions between macroscopic collections of matter. Pushing a car up an inclined surface or kicking a football across a room or in a playground or pushing any block from one place to another place or shifting large blocks from one place to another are some everyday examples where contact forces are at work.

The various types of contact force are shown in the image added below,

Frictional Force

Friction is a force between two surfaces that are sliding, rolling or dragging across each other. For example, If we try to push an object like book along the floor, friction makes this difficult. Frictional force or opposing force always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows the speed of a moving object down.

The amount of frictional force exerted depends on the materials of which the two surfaces are made up of. As we increase the extent of roughness in the surface, more friction is produced. Friction also produces heat.

Example of Frictional Force

Various example of frictional force are,

• Frictional force is a useful force because it prevents our shoes from slipping on the floor when we walk and stops car tyres from skidding on the road.
• When you walk, friction is caused between the thread of shoes and the surface of the ground. This friction acts to grip the ground and prevent sliding on the road.
• Players use spikes in their shoes to enhance the friction between the ground and the shoes so that they don’t slip.
• Players use gloves during batting to increase the friction and decrease the chances of slipping the bat from their hand.

Friction Force Formula

The force of friction is calculated by using the following formula

F = μN

where,

• F is Force of Friction
• μ is the Coefficient of Friction
• N is the Normal Reaction Force

Muscular Force

Our muscles exert a force on the other body when we try to lift it, bend it or in any way try to disturb its state of rest. This force exerted is called Muscular force. Many activities like lifting an object, walking on the ground, running, bending, boxing requires muscular force.

Example of Muscular Force

Various example of muscular force includes,

• Muscular forces can also be required in Strolling, lifting, getting up from a seat, crossing a leg.
• In a game of tug of war, the team which pulls the rope with a greater force wins as the rope goes in the direction of greater force.
• Whenever we are to lift a book or any object we need to apply a force that is greater than the reaction force exerted by the object.

A man pushing a block with muscular force is shown in the image added below,

Normal Force

The reaction force applied by any object that balances the gravitational force of the Earth is called the Normal force. This force is called the normal force as it is always applied to the normal of the surface. Suppose we observe a bag lying on a thetable then the gravitational force acts on the bag in the downward direction this force is balance by an equal and opposite force called the Normal force that acts normal to the surface of the bag.

Applied Force

The force applied to a person or an object that changes the speed, shape, and direction of the object is called the applied force. This force is the force of push or pull that is applied to an object.

Tension Force

The force experienced in the string of a stretched string is the example of the Tension force. Suppose a mountanier climbs a mountain using a rope then his/her weight is balance by the tension force in the string.

Spring Force

The force of compressed or stretched string is called the spring force. When we stretch or compress a string its stores some energy and this energy is responsible for the spring force.

Air Resisting Force

The force experience by any object moving in the air is called the air resistance force. This is a type of Frictional force, suppose we drive our bike on a windy day against the wind then the wind apply a resisting force on our bike called the air resisting force.

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.