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GCSE Engineering Mock Revision (Comparing Mild steel and aluminium when…
GCSE Engineering Mock
Revision
Metals and their properties
Ferrous Alloys
Cast Iron-good compressive strength, rusts easily, cheap, difficult to machine- used for anvils, engine blocks
Low-Carbon steel- strong, tough, cheap- used for nails and screws, car bodies
High-Carbon Steel- strong and hard, difficult to form, not as tough as low-carbon steel- used for saw blades, hammers and chisels
Stainless Steel- strong and hard, difficult to machine, good corrosion resistance, expensive- used for knives and forks, medical equipment and sinks
Non-Ferrous metals
Aluminium- light,soft,ductile,malleable, good conductor of heat/electricity, corrosion resistant- used for aircraft bodies, saucepans, cooking utensils, foils, cans
Copper- malleable, ductile, tough, good conductor of heat/electricity and easily joined- used for electrical wire, printed circuits
Brass- corrosion resistant, good conductor of heat/electricity and casts well- used for castings, forgings, ornaments
Bronze-tough, hard wearing, corrosion resistant- used for bearings, coins, water valves
Lead-very soft, malleable, heavy, corrosion resistant, low melting point- used for soft solders, roof coverings
Zinc- low melting point, corrosion resistant, easy to work with- used for coating steel, metal dustbins, die casting
Equation for pressure
What are Composite materials?
Composites are made by combining different types of material to develop combinations of properties that are not possible in individual materials
Comparing Mild steel and aluminium when manufacturing car bodies
Similarities
They are both malleable and ductile
They are both machinable
They are both weldable
Differences
Aluminium is expensive whereas mild steel is cost-efficient
Mild steel is heavier and denser
Aluminium can be formed into shapes mild steel can't
Ease of manufacture
Mild steel can be carburised
They can both be welded with ease
You can smelt aluminium which can be mass produced
Gear ratio
Diameter of driven gear
/ diameter of driver gear
Number of teeth on output gear / number of teeth on input gear
Area of a circle
Advantages and disadvantages of a chain and sprocket and a pulley system
It can be noisy and more expensive than a belt and pulley drive system. The chain and sprocket drive does not allow slip.
The chain cannot slip on the sprocket because the sprocket teeth prevent the chain from slipping.
.
Pulley Belt
It helps in applying force in any direction
Pulley systems rely on the relationship between load and effort.
Useful for getting the drive action to happen in awkward places
Mechanical advantage is defined as the ratio of load to effort.
A movable pulley is a pulley that moves with the load.
Increases Lifting Distance
