Show:
Forestry
Mining
Then, Now
Common Compound Machines
The Power Of Compound Machines
100
The machine that cuts down trees is a Feller Buncher.
What is the name of the machine that cuts down trees today?
100
In the past they used mine carts pulled by horses (pit ponies) or pushed by people. Today, they use conveyor belts to move coal.
How did they move coal before and now?
100
In the past they used a horse-drawn plough. Today, they use a tractor-pulled plough that ploughs faster than before.
What is the name of the compound machines that are used to plough in the past and present?
100
A bike has a lever, wheel and axle, pulley, and a screw.
What is the simple machines in a bike?
100
The advantage is the simple machines advantages are combined.
What is the advantage of a compound machine?
200
The trucks and trains bring the wood to the sawmill to get cut up.
Where do the trucks and trains bring the logs to?
200
A conveyor belt takes away other types of rock from the coal.
What does the conveyor belt do?
200
Now a days, people don't have to do as much work as a long time ago and machines do more of the work.
What has changed over time?
500
A pencil:wedge and lever,window: wedge and lever, t.v.: screw, wheel and axle.
What are some compound machines found in a school?