Free body Diagram
As force is a vector quantity, it can be represented by a vector arrow. Representation of force vectors show the relative magnitudes and directions of all forces acting on a single object in a given situation. This is Known as free body diagram.
Below are some examples of free body diagrams that show all the forces acting on just a single body in each case.
Note the forces acting on the dumb-bell will move up if the lifting force is greater than its weight, which is the gravitational force acting on the dumb-bell.
Buoyant force or upthrust is an upward force exerted on an object immersed in a fluid, The following figure shows an example of a buoyant force acting on the duck. Another example of buoyant force in action can be observed in a balloon floating in the air.
Tension is the pulling force that is developed in a stretched material, like rope, string, spring, or chain. It is always directed along the length of the material doing the pulling.
Normal force is a pushing force that exists between two objects in contact, acting perpendicularly to their surface of contact. Normal force opposes a force that presses the two objects together.
Clearly, each body on the earth experience gravitational force pulls the body towards the ground at all times, an opposing force of equal magnitude exists to maintain the body at rest in the example given.
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