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26 Cards in this Set
- Front
- Back
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For "work" to be done, you must apply a force and the object must ___ in the direction of the applied force.
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move
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If you prevent an object from moving, then ______ work has been done
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no
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Energy as a result of an object in motion is called ....
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kinetic energy
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Energy of position or altitude is called ....
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potential
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The unit we use for energy is....
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joule (J)
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The unit for kinetic energy is...
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Joule (J)
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Another way of writing joule is....
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Newton.meter (N.m)
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The unit for potential energy is ....
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Joule (J)
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Energy can neither be ____ nor ____ but can change forms
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created
destroyed |
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When an object on a cliff falls, it loses _____energy and gains ____ energy.
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potential
kinetic |
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The formula to calculate work is...
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W = F d
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The formula to calculate kinetic energy is....
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KE = 1/2 m v^2
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When you double your velocity or speed, by how much does it increase your kinetic energy?
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X 4
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The formula to calculate Gravitational Potential Energy, (PEg) is....
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PE = m g h or
PE = W h |
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When a pendulum is at the bottom of its swing, what is the potential energy (PE)?
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Zero
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When a pendulum is at the top of its swing its kinetic energy (KE) is ....
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zero
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When a pendulum is at the bottom of its swing, its kinetic energy is at its ______
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maximum
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Where, in a pendulum's travel, is the velocity the fastest?
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At the bottom of the swing
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When a pendulum is a the top of its swing, its potential energy is at its ______.
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Maximum
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When does a pendulum have its greatest amount of "energy of position"?
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At the top of its swing, before it is let go
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If a net force of 11 N is used to push a box across the floor for 3 meters, then what work was done on the box?
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33 Joules (That's F x d or 11N x 3m)
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If you weigh 500 N and you move yourself up 4 meters of stairs, then how much work did you do?
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2000 J (That's W x h or 500 N x 4m )
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If you weight 500 N and you move yourself up 4 meters of stairs, then how much potential do you have at the top of the stairs?
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2000 J
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If your 1000 kg car is moving 2 m/s, then how much kinetic energy does it have?
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2000 J (That's 1/2 x 1000 x 2^2)
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If your 1000 kg car is sitting still, then how much kinetic energy does it have?
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Zero J
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If your car has 4000 joules of kinetic energy at the bottom of a hill, how much PE (potential energy) does it now have at the top of the hill after it coasts to a stop?
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4000 J
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