Force And Pressure
# Force :
-The external agent which can changes the speed and the direction of motion on the shape of body.
- force is a push or pull which can change or try to change the state of motion of the body.
- It is represented by F.
- Unit of force is Newton (N)
- It is a vector quantity.
# Types of force :-
1. Fundamental force :
a) Gravitational force
b) electromagnetic force
c) weak nuclear force
d) strong nuclear force
- Among of these four forces gravitational force is weakest and strong nuclear force is strongest.
- Gravitational , nuclear forces are attractive in nature . but a electromagnetic force may be attractive or repulsive .
- Gravitational and electromagnetic force are long range force but nuclear force are very short range force .
2. Derived force :
All persists except fundamental force are called as derived force .
Example :- muscular force, frictional force, mechanical force .
3. Contact force :
Force that arises with the contact up to armor objects involved are called as contact force.
4. Non-Contact force :
Force that arises without the contact of two or more objects involved are called as non-contact force.
5. Balance force :
It is comparison of two or more . If the result of forces in a body is zero those force is are known as balance force.
Ex. Tug a war
6. Unbalance force :
When two or more forces causes change in state of motion Then it is called unbalance force .
ex. If you kick a football and it moves from one place to another.
# Pressure :
- pressure is defined as the physical force exerted on an object the force applied is perpendicular to surface of objects per unit area.
- It is represented by capital 'P'
- It is a scaler quantity.
# Types of Pressure :
- Absolute
- Atmospheric
- Differential
- Gauge
P = F/A
.