This GCSE Physics quiz challenges you on forces and hydraulics. Pressure can be transmitted in all directions through all fluids. It is transmitted particularly efficiently through liquids. Although their particles are further apart than solids, they are still close enough together for liquids to be non-compressible. That means that when pressure is applied to the surface of a liquid its volume remains the same. If you fill a flexible container (for example, a balloon) with water and squeeze it, it will change shape but not volume. Areas that are not supported will bulge out, wherever they are showing that the **pressure is transmitted in all directions through liquids**.

This means that liquids can be used to transmit pressure over long distances and round corners by using tubes in a **hydraulic system**.

1.

What are the units of pressure?

Coulombs

Pascals

Volts

Newtons

One pascal is a force of one newton acting over one metre squared so they are quite small units

2.

What fact can be said of liquids?

They are virtually incompressible

Easily compressible

All liquids have the same molecules

No liquid can be mixed with another liquid

Using a liquid in a hydraulic system is a good idea, as the liquid transfers the pressure from one side of the system to the other. Changes in the area of a section of the system can allow the force to be multiplied

3.

What is the formula used to calculate pressure in different parts of a hydraulic system?

Pressure is a measure of the force per unit area

4.

A 2 cm x 5 cm rectangle within a hydraulic system experiences a force of 50 N. What is the pressure within the system?

50 Pa

500 Pa

5 Pa

50,000 Pa

Always check units given in the question. It is common for measurements to be given in cm^{2} when a formula requires them to be in m^{2}. 10 cm^{2} = 0.001 m^{2}

5.

Different cross-sectional areas on the effort and load sides of a hydraulic system enables it to be used as a what?

Boat

Force multiplier

Mass multiplier

Electron multiplier

For a given pressure, if it acts over a larger area, the force will be greater

6.

Which of the following can benefit from the use of hydraulics?

Digger

Glass cup

Printer

All of the above

Diggers and brakes are two common GCSE examples of the use of hydraulic systems

7.

If a system has an area of 2 m^{2} at its effort side and 5 m^{2} at its load side, how much more force does the load side experience?

100% more

200% more

250% more

300% more

Simple proportion

8.

How is pressure distributed in a liquid?

Non-uniformly in one direction

Equally in one direction

Equally in all directions

Non-uniformly in all directions

This is Pascal's law

9.

What is the length of a rectangle within a hydraulic system having a width of 5 m that is subjected to a pressure of 15 Pa and a force of 15 N?

0.1 m

0.2 m

0.5 m

1 m

Rearrange the pressure equation to work out the area. You know the length of one side of the rectangle and so you can work out the length of the other

10.

What is the pressure of a system which experiences a force of 100 N over an area of 10 m^{2}?

1 Pa

10 Pa

100 Pa

0.1 Pa

100 divided by 10

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