## AQA GCSE Work done

**Work done**

Work done means energy transferred. So, when work is done, energy is transferred from one energy store to another energy store.

**Example**

The boy lifts the box from the ground to above his head, so **chemical potential energy store** is transferred mechanically to **gravtiational potential energy store**

The boy does **200J** of **work** on the box, to raise its height. This means that the box will** increase** its **gravitational potential energy** store by** 200J**

**Work done **depends on:

**Force**

**Distance moved in the direction of the force**

The **larger** the **force** used, or the **greater** the **distance** the object travels, the **greater** the** work done,** or **energy transferred**.

**Force** is** directly proportional** to **work done**

**Distance** travelled in the **direction of the force** is also **directly proportional** to the **work done**.

__Examples of questions__

__Examples of questions__

**Work done = force x distance moved in the direction of the force**

**Work done = 40N x 30m = 1200J**

2. The man has a weight of 500N and is being lifted upwards from the bottom platform to the upper platform by the escalator. Calculate the work done in lifting the man from the lower platform, to the upper platform.

**In this case, the man is being lifted, so the force is acting upwards. Therefore the distance that should be used would be the 9m. **

**Work done = force x distance moved in the direction of the force**

**Work done = 500N x 9m = 4500J**

**Practice Questions**

1.A man lifts a box of fruit with a weight of 200N from the ground to 1.5m above the ground. Calculate the work done

2. A ferromagnetic crane lifts some scrap iron of weight 20kN upwards from the ground, travelling a distance of 350cm. Calculate the work done.

3. 40000J of work is done to push a car of weight 7000N along a length of road. Calculate how far the car travels.

4. Sketch a graph to show the relationship between work done and force. Put work done on the Y axis and Force on the X axis.

Need more questions, try our worksheets.

Absorption and Emission of EM Radiation

JJ Thomson and Plum pudding model

Ernest Rutherford and the Nuclear Model

Niels Bohr changing the Nuclear Model

Discovering the Proton and Neutron

Measuring radiation from radioactivity

Radiation types and properties

Random nature of radioactive decay

Radioactive contamination or irradiation

Hazards of contamination and irradiation

Studies on the effects of radiation on humans

Different half lives of radioactive isotopes

Nuclear Fission Chain Reaction

Writing nuclear fission equations