1
Two bevel gears of equal size rotate at what speed?
The same speed
What connects the front sprocket to the back gears on a bicycle?
Chain
What is used to calculate the gear ratio of a gear system?
Teeth
In a bicycle systems diagram, pedaling force is the ___________.
Input
In which region was iron smelting first discovered?
South Africa
What term describes the way a gear turns clockwise or counterclockwise?
Direction of rotation
What is the name of the large gear located at the front of a bicycle?
Chain wheel (front sprocket)
In a systems diagram of a bicycle, what does the bicycle represent?
Process
What historical period is known for the development of iron tools?
Iron Age
If the driven bevel gear is larger than the driving gear, how will it move?
It will turn slower
When does dust pollution occur at mine dumps?
When water dries and fine particles are blown away by the wind
What is the main purpose of bevel gears?
To change the direction of rotation
What environmental problem can acid mine drainage cause?
It pollutes rivers and kills plants and animals
What does gender bias mean in the workplace?
One gender is treated as more important and given better opportunities
What is one reason women are underrepresented in the mining industry?
Women are not physically capable
What is the function of a sheave wheel in a mine head frame model?
To guide the rope or cable and allow it to turn smoothly
What is the main purpose of the winch drum in the model?
To raise and lower the cage
What is an important safety rule during model construction?
Keep tools organized and use them carefully
How do you calculate the total cost of the project?
By adding all subtotals for materials, lift components, and labour
What is needed to help women access more careers in mining?
Changes in perceptions and equal opportunities
Why does triangulation make structures stronger?
Because triangles cannot easily change shape
What advantage does a chain drive have compared to spur gears?
The chain can bend slightly sideways
Why is the acid produced in abandoned mines harmful?
Because it is corrosive and poisonous
Why did mining companies remove old mine dumps in later years?
To recover remaining gold and safely store the waste
Why is mining important to South Africa’s economy?
It provides important metals and minerals