Materials technology
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Materials Technology. II Categorising Materials Braking systems. vocabulary useful in this section. compound , exotic (material), ferrous , non-ferrous, ceramic, alloy, metallic , non-metallic, polymer consist of, comprise, made of, made from, made out of.

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Materials Technology

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Materials technology

Materials Technology

II Categorising Materials

Braking systems


Vocabulary useful in this section

vocabulary useful in this section.

  • compound, exotic (material),

  • ferrous, non-ferrous, ceramic, alloy,

  • metallic, non-metallic, polymer

  • consist of, comprise,

  • made of, made from, made out of


Materials technology

4.1 What do brakes do and how do they work?

Brakes are designed to slow down vehicles or moving parts. Often they work through friction, by applying pressure to pads which are pressed against the sides of a disc, the inside of a drum, or directly against a wheel rim. Alternatives include systems that use electromagnetic force, systems that exploit the braking effects of engines or flywheels (via clutches and gearboxes), aerodynamic braking systems (for example spoilers on aircraft, parachutes on dragsters), and reverse thrusters on jet engines.


Materials technology

4.2 What kinds of materials are used in brake pads and brake discs in different vehicles?

Brake discs are often made of ferrous metals (iron-based – for example steel), or sometimes ceramic materials.

Examples of materials used to make pads include: compounds of advanced

materials (cars), ferrous metals (trains), rubber (bicycles), ceramics

(performance cars).


Materials technology

5-A Read the article on braking systems.

What do colours in the title refer to?

Green refers to ecological issues.

Redrefers to heat (red hot means very hot). Also, a hottopic is a current important topic.


Materials technology

5-B Why do most braking systems waste energy?

What are regenerative braking systems,

and how do they save energy?

What characteristics are required of

materials used for the brakes on racing

cars?


Materials technology

Answers

Because they use friction, which wastes energy as heat

They recover heat and use it to power the car.

The ability to generate high levels of friction, and to resist the effects of friction and consequent heat

Heat from the engine being absorbed by the chassis, which can damage sensitive parts such as electronic components and plastic parts


Materials technology

1-(c)


1 c 2 g

(1-(c) 2-(g


3 b 1 c 2 g

3-(b) (1-(c) 2-(g


3 b 4 f 1 c 2 g

3-(b) 4-(f) (1-(c) 2-(g


3 b 4 f 5 d 1 c 2 g

3-(b) 4-(f) 5-(d) (1-(c) 2-(g


3 b 4 f 5 d 6 a 1 c 2 g

3-(b) 4-(f) 5-(d) 6-(a) (1-(c) 2-(g


3 b 4 f 5 d 6 a 7 e 1 c 2 g

3-(b) 4-(f) 5-(d) 6-(a) 7-(e) (1-(c) 2-(g


1 a b c

1- ( a , b , c )


1 a b c 2 d e

1- ( a , b , c )

2- ( d, e )


1 a b c 2 e d 3 d

1- ( a , b , c )

2- ( e , d )

3- ( d )


1 a b c 2 e d 3 d 4 e

1- ( a , b , c )

2- ( e , d )

3- ( d )

4- (e)


1 a b c 2 e d 3 d 4 e 5 a b c

1- ( a, b, c )

2- ( e, d )

3- ( d )

4- ( e )

5- ( a, b, c )


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