Question

small essay about force

Answer 1

Definition of force: strength or energy as an attribute of physical action or movement.

Answer 2

Force is that factor which is necessary to change the position and state of a body. Laws of motion give the clear picture of force in following manner:

(a) First law describes the importance of force in changing the state of a body from rest to motion to or from motion to rest.

(b) Second law states that the force causes rate of change of velocity of a body during motion.

(c) Third law describes how a body reacts against the force applied on it and, consequently, moves forward.

Therefore, we can say that a force is push or a pull. According to Newton, a force is something that has the ability to accelerate an object. Remember, acceleration is not just limited to speeding up. It also includes starting, stopping, slowing down, and changing direction. Therefore, a force is something that causes an object to start, stop, speed up, slow down, or change direction. The unit of measurement for force is the Newton (N). One Newton of force is defined as the force required accelerating a 1 kg mass at 1 m/s2.

Some important factors to consider when describing a force- are the magnitude of the force, the point of application, and the direction that force is being applied. We are able to represent force mathematically by using a vector. A vector is a mathematical representation of anything that is defined by its size and its direction. On paper a vector is represented as an arrow. The length of the arrow represents the magnitude of the force, the shaft of the arrow represents the line of application of the force, and the arrowhead indicates its direction along the line of application.

Forces may be classified in to the following forms:

(a) External Forces:

External forces are forces that act on an object as a result of its interaction with the environment surrounding it. External forces can be either contact or non-contact forces. Gravity is the only non-contact force.

(b) Internal Forces:

Internal forces are forces that act within the body. Bones, muscles, tendons, ligaments, cartilage, and other tissues exert forces on one another.

(c) Force of Friction:

Friction acts between two surfaces of solid objects or rigid bodies in contact and acts parallel to the contact surfaces.

Friction force is proportional to the normal contact force. As the normal contact force is increased, the friction force is also proportionately greater.

If two parallel forces are applied on bodies their combination may be obtain by adding (if both are in same direction) or subtracting them (if both are in opposite directions).

If two non-parallel forces applied on a body, their combination will be the resultant, a line joining head of the force opposite to the body, to the tail of the force towards the body.