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24 Cards in this Set
- Front
- Back
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What is energy?
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An object has energy if it can produce a change in itself or in its surrounding
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When you have a lot of energy you can run faster, jump higher can objects have energy
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Yes objects can have energy.
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A stone falling off a high ledge has enough energy to damage a car roof this is an example of
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ENERGY
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A 10-Speed bike is an example of energy because it has the ability to
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change speed and allow the rider to select the speed that makes the bike easiest to ride when going uphill
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If you spend time lifting boxes onto a truck, you will get tired and hungry, why would you eat food?
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To get more energy
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When you eat food to give you more energy to complete your homework what is happening
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the energy in the food is being transferred into the energy to complete the work.
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The word work has an everyday meaning and a
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Scientific meaning
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Work everyday meaning and scientific meaning
When we say physics is hard work is this the same way Work is used in physics |
NO in physics WORK is a scientific term
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When lifting crates and boxes or any other object we do more work when the object is
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heavier
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The task of lifting an object is even harder if the object has to be lifted
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higher
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What is the calculation for measuring energy transferred when lifting
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W=FD
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W=FD
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Force times distance is used to measure the amount of energy
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W=FD
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W=work, F=force, D=magnitud of displacement in the direction of foce.
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Not work is a ______quantity.
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Scalar (it has no direction)
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The SI unit of work is the
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Joule (JOOL)
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Who is the Joule named after?
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James Prescot Joule, a 19th century English physicist and brewer
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If a force of one newton moves an object one meter this means
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one joule of work is done.
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1 Joule (j)=
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1 newton * mete (N*m)
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Work is done on an object_____
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only if the object moves
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If you hold a banner in the same place for an hour and your arms get tired did you do any work on the BANNER
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NO there is no work on the banner because the banner didn't move.
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What if you carry a banner in the same velocity an the same height (constant) height is this considered a definition of work?
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NO work was done on the banner. The force you exert is upward and the motion is sideways so the banner gains no energy.
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Work is only done when force and displacement
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are in the same direction.
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The area under the cuve of a force displacement graph represents the ___ ___
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work done
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Work is done only if a foce is exerted in the direction of
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motion
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