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What is an efficient machine?
An efficient machine uses the LEAST amount of energy possible
An object will stay at rest or keep moving unless...
...something interrupts it.
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.
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.
What are water wheels used for?
Water wheels are used to produce energy.
What kind of energy changes motion/position of an object?
Mechanical Energy
Thinking about our "Working Wheels" project, we learned that as water drops potential energy turns into _________ energy.
Kinetic
Thinking about our "Working Wheels" project, we learned that water at a higher level has what kind of energy?
Potential energy
The steeper the angle of an inclined plane the __________ the vehicle will move.
Faster
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.
What are 3 ways to reduce friction?
1.Use smooth and hard surfaces. 2. Minimize surface contact. 3. Stabilize moving parts. 4. Reduce tension at moving parts. 5. Use lubricant.
In order for your vehicle or device to move using the least amount of effort you need to reduce __________________.
Friction
What is friction?
The force of resistance which is encountered when two objects rub against each other.
What is an axle?
The shaft at the center of the wheel.
What is speed?
The measurement of how fast an object moves.
What is potential energy?
Energy which is stored by an object.
What is a chassis?
A frame upon which a vehicle is built.
What does this picture show?
Linkage
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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