Actually, there are many types of forces in nature for example, gravitational forces, electrostatic forces and nuclear forces. But in case of mechanics, we have other three forces are there, i.e., frictional forces, elastic force and force due to surface tension.
Force is a vector quantity, if more than one force applied on the body, we can find the resultant force using the laws of vector addition.
There are two case of moving the body along the direction of motion. One is the resultant force acting on the body along the direction of motion of the body, when its get accelerated. Another one is resultant force acting on the body along opposite direction of the body, when its get deaccelrated. Above figure shows the forces acting on the body.
The resultant force Fr=F-(Fv+Fs)
When the resultant force is zero, then the external force balances with the sum of viscous and frictional forces which causes the body moves with uniform velocity.
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