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A force imposed on an object by a person or another object.

Sudden load acts suddenly on the structure and stays for longer duration. While impact load also acts suddenly on structure but won’t stay for longer duration,it leaves suddenly.

### What is the strain energy stored in a body due to gradually applied load?

The strain energy stored in a body due to external loading, within the elastic limit, is known as resilience and the maximum energy which can be stored in a body up to the elastic limit is called proof resilience.

Example-When a body lowered down with the help of a crane, the body first touches the platform on which it is to be placed. On further the chain,the platform goes on loading till it is fully loaded by the body. This is the case of gradually applied load.

Examples of impact loadings in this field: 9 Impact by people themselves when running, jump- ing or falling with a tilting ladder; 9 Impact of objects when dropped or in process of being moved, for example dishes, tools, furniture; 9 Impact of thrown objects.

#### How do you find the load applied?

Multiply the mass of the object by the gravitational acceleration of the earth (9.8 m/sec2), and the height in meters. This equation is the object at rest’s potential energy. Potential energy is measured in joules; this is the load force. Imagine a box on the floor, of which the weight is unknown.

The main difference is that FORCE IS APPLIED BY THE OBJECT and LOAD IS APPLIED ON THE OBJECT.