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What is potential energy? |
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Energy due to position or condition (stored energy). Example: holding a rock at the top of a roof |
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What is kinetic energy? |
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Energy in motion
Example: a ball going through a hoop |
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What is an example of a first class lever? |
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A seesaw - fulcrum is in the middle. |
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What are some examples of simples machines? |
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Inclined Plane, Lever, Pulley, Wedge, Wheel and Axle |
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What is does the law of the conservation of energy tell us? |
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Whatever energy you put in is the same amount of energy you get back. No energy disappears or is added. |
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If a man lifts a box onto a truck and another man pushes the same box up an inclined plane into the truck - Who does more work? |
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Neither - they both do the same amount of work. Work = Force x Distance |
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What is Newton's 3rd Law? |
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For every action, there is an equal and opposite reaction. |
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What is Newton's 2nd Law? |
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Force = Mass x Acceleration |
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What is Newton's 1st Law? |
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An object in motion stays in motion until acted on by another force? |
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How does a lever make work easier? |
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A longer lever increases the distance reduces the the force.
W = Force x Distance |
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What is an example of a 2nd class lever? |
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A wheelbarrow. Fulcrum is at the end, resistance is in the middle, effort is at the end. |
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What kind of simple machine is a screw? |
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An inclined plane wrapped around a cylinder. |
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What is an example of a 3rd class lever? |
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A shovel. Fulcrum at one end, effort force in the middle, resistance at the end. |
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If a large brick and a small rock were dropped at the same time, which would hit the ground first? |
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Both will hit the ground at the same time because gravity is pushing them at the same rate. |
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What does aerodynamic mean? |
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It means that an object has very little drag/air resistance. |
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What type of nose cone worked best in our rocket tests? |
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A pointed cone worked the best. |
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Why does a rocket need wings? |
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To stabilize the rocket |
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Where does some energy go when we do work? |
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It turns into heat. |
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How does a pulley make work easier? |
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It changes the direction of the force. |
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