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20
×
How is potential energy created in a homemade catapult using an elastic band?
As you twist the elastic you are exerting energy. This energy is stored in the twisted elastic.
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25
×
Thinking about our "Working Wheels" project, we learned that water at a higher level has what kind of energy?
Potential energy
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15
×
What is an axle?
The shaft at the center of the wheel.
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trap
No points!
Oops!
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star
Double points!
Okay!
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fairy
Take points!
5
10
15
20
25
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lifesaver
Give 15 points!
Oops!
25
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How can a simple crane with a pulley system and a crank make it easier to lift heavy objects?
The pulley system changes the direction of the force to make it more convenient to lift the load.
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15
×
What is friction?
The force of resistance which is encountered when two objects rub against each other.
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20
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What is an efficient machine?
An efficient machine uses the LEAST amount of energy possible
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20
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What kind of energy changes motion/position of an object?
Mechanical Energy
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lifesaver
Give 25 points!
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seesaw
Swap points!
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gift
Win 15 points!
Okay!
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baam
Lose 20 points!
Oops!
25
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What are the 2 main points stated in Newton's Second Law of Motion?
The greater the force on an object, the greater its change in speed or direction. The heavier an object, the less its change in speed or direction.
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15
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In order for your vehicle or device to move using the least amount of effort you need to reduce __________________.
Friction
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trap
No points!
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magnet
Take 15 points!
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rocket
Go to first place!
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lifesaver
Give 20 points!
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15
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A device for doing work in which a force which is applied at one point to overcome a force at another point is called...
A machine!
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boom
Lose 50 points!
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magnet
Take 25 points!
Okay!
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gift
Win 25 points!
Okay!
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banana
Go to last place!
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15
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What is potential energy?
Energy which is stored by an object.
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20
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What are water wheels used for?
Water wheels are used to produce energy.
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