Type of force
Table of Contents
Type of force-
Force –
We have always experienced that when there is a need to lift an object or move it from one place to another,
we have to make efforts.
Some objects can be easily removed with very little effort, such as a pencil, book, ball, bat, empty bucket, etc.
Heavy objects like a cart loaded with goods, a heavy gun, a large table, a loaded bucket,
a playground roller can be moved with difficulty only with great effort.
Whereas it seems impossible to move or remove objects like trees, pillars, walls embedded in the earth.
When we go from home to school on a bicycle,
we have to make efforts by pedaling to keep it moving.
Similarly, to change the velocity of a moving object, i.e. to increase or decrease the velocity, effort is also required.
To stop or reduce the speed of the bicycle, brakes have to be applied.
Effort is also required to change the direction of motion of the object.
For example, to turn a moving bus, the steering wheel has to be rotated.
The conclusion is that effort is required to change the position of an object or to change its state of rest or motion.
Sometimes such efforts are not successful, but this fact is proved by experience that when efforts are made,
a tendency arises in the object to change its state of rest or motion.
Force is the effort made to change the position of an object.
Therefore, force is that external agent which changes the state of rest or motion of a body or creates a tendency for change.
To express a force completely,
it is necessary to mention both its magnitude and its direction.
Hence force is a vector quantity. C.G. In S system the unit of force is dyne and S.I
In the system it is expressed in Newton (N).
If the values of any two quantities of acceleration force or quantity are known,
the third value can be found from the relation formula P = m × a.
For example, the value of force required to produce an acceleration of 25 m/s in a 20 kg object (ball) is 20 x 25 =
Will be 500 Newton (N).
Classification of Force
(1) Muscular force-
Force applied by the muscles of a person or animals to pull, push or remove an object.
(2) Tension force –
When an object is tied with a string or chain and hung, pulled or rotated, this force is generated in the string or chain.
(3) Gravitational force-
Every body in the universe produces this force by mutual attraction on each other.
(4) Gravitational force of the Earth-
The force of attraction exerted by the Earth on every object.
(5) Reaction force –
The force applied by the object on the reactant opposite to the direction of the force applied on the object.
(8) Friction force-
force opposing motion on an object moving on a rough surface.
(7) Magnetic force-
The force exerted by the pole of a magnet on a magnetic object or another magnetic pole.
(8) Electric force-
The force exerted by an electric charge on objects or on other electric charges.
(9) Electromagnetic force-
The force exerted by current carrying conductors on a magnet or by a magnet on a current carrying conductor.
(10) Nuclear force-
The force exerted on each other between the components of the nucleus in the nucleus of an atom.
Balanced And Unbalanced Forces
Applying force on an object can have the following three effects.
1. The speed of the object may change.
2. The direction of motion of the object can change.
3. The shape of the object can change.
On this basis, we can say that those forces which when applied on an object do not cause any change in the motion of that object, are called balanced forces.
Example:-
In the game of tug of war,
if the force applied by both the teams is equal, then the rope.
And there is no change in the positions of both the teams.
In this situation the force applied by them is balanced.
The force which changes the motion of an object is called unbalanced force.
Example:-
In the game of tug of war, the force applied by the winning team is more.
In this condition the applied force is unbalanced.
Balanced forces can change the shape of an object.
Not in motion, while unbalanced forces can change the motion of an object but not its shape.
( Type of force )
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