Static and dynamic loading

Static load:

It do not change in magnitude or direction or poin of application. 

Dynamic load:

These loads varies in Magnitude and direction. 

Types:

These are of two types:

1. Which are of the same kind but change in magnitude such as the varying weight of traffic passing over a bridge. 

2. Live loads in which the magnitude changes from a maximum of one kind to maximum of the opposite kind such as the piston rod of a double acting engine. 

Impact load

The load which are applied with velocity are called as impact loads. 

For example : blows of a hammer,  rough road reaction to the wheels and axles of motors and cars.