Examples
Trade Off
Activities
Random
English Word
100
Give one example of a screw.
Teacher decide. Possible answer: screw.
100
Explain the trade-off for an inclined plane.
Distance travelled traded for force to lift/lower a weight.
100
Why would driving a car with no wheels be difficult.
Too much friction.
100
Where do you see wheel and axel?
Wheels of a car, for example.
100
What is 滑轮 in English called?
Pulley
200
Give an example of an inclined plane.
Teacher decide. Possible answer: ramp
200
Explain the trade-off in a lever.
Force used to spin a lever vs the distance from the point of contact to the fulcrum.
200
What is the fulcrum of the person in our magic trick?
Foot.
200
What can you use a pulley to do?
Lift heavy objects.
200
What is 投石器 in English?
Catapult.
300
Give one example of a wedge.
Teacher decide. Possible answer: knife
300
Explain the trade-off in a screw.
Force required to put a screw in an object vs the time (caused by distance to spin) required to screw it in.
300
Where is the fulcrum of the lever in the catapult?
Under the orange rubber band.
300
What simple machine is used in a pyramid?
Inclined plane.
300
What is a fulcrum?
The point that doesn't move on a lever. The center or revolution.
400
Which simple machine is this?
Lever
400
Explain the trade-off in a pulley.
To use lesser force, you need to pull for a longer distance.
400
How does the magic trick work?
Teacher decides.
Simply put, the direction of force is changed. To not spin, aim at the foot.
400
Which two simple machines are included?
Lever and Wheel and Axel
400
What does trade-off mean?
A balance between two desirable things. 权衡
500
What simple machine is this?
Lever
500
Explain the trade-off in a wedge.
To pull something apart very far, you need to push the wedge a long distance.
500
How does a simple single pulley save you energy when lifting something?
Your own gravity works in your favour, rather than against you when lifting.
500
Which two simple machines are included in a scissor?
Lever and Wedge
500
What is mechanical advantage?
机械优势