Describe the nature of force.
Answers
A force is an effort that changes the state of an object at rest or at motion.
It can change an object's direction and velocity.
Force can also change the shape of an object.
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✦ Normal force :
The normal force is the force that surfaces exert to prevent solid objects from passing through each other.
✦ Applied force :
An applied force is a force that is applied to an object by a person or another object.
✦ Frictional force :
Frictional force refers to the force generated by two surfaces that contacts and slide against each other.
✦ Tension force :
The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
✦ Spring force :
The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it.
✦ Resisting force :
Resistive force is a force, or the vector sum of numerous forces, whose direction is opposite to the motion of a body.
We have a general concept about force from our daily life experiences. When we pull or push a body, then we say a force is applied upon the body. This applied force can create or tends to create motion in a stationary body. If the body is in motion, then the applied force can cease the motion of the body or tries to increase its velocity. In both cases to apply force, it needs direct contact between the force applier and the body. These types of force are known as contact force. If the two bodies are not in direct contact, still they can apply force on each other. Such a well-known force is the force of gravitation, whose practical example is the weight of a body.