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23 Cards in this Set
- Front
- Back
When cutting cardboard with scissors, why is it a good idea to move the cardboard as close as possible to the scissors' pivot point? (Consider the torque about the pivot.)
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There is a constant torque, so a small lever arm gives a large force
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Which is not an example of something with potential energy?
A wound clock spring A stick of dynamite A moving car A ball at the top of a hill |
moving car
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A car skids to a stop. What happens to its kinetic energy?
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turns into thermal energy
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Impulse is
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how momentum is transfered
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work is
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how energy is transfered
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spinning carousel is
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angular momentum
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When a modern car crashes into a tree and comes to an abrupt stop, the driver's face and chest collide with an air bag rather than with the steering wheel. The driver's chances of serious injury are reduced by hitting the air bag rather than the steering wheel because the driver transfers
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the same amount of momentum to the air bag as he would to the steering wheel, but he does it with smaller force due to the air bag.
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A skater who pulls in her arms speeds up because
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she makes the moment of inertia smaller
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impulse is
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force times time
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Which is bigger, static or sliding friction?
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static
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power is
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work per time
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push or pull
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force
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mass
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measure of inertia
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that object thats attracted directly toward the center of the earth with a force we call objects
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weight
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lose weight by
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reducing mass or going some place like small planet where gravity is weeker
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components
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the portions of a vector quantity that lie along particular directions
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trajectory
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the path taken by an object as it moves
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support force
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a force that is exerted when two objects come into contact. each object exerts a force on the other object to keep the two from passing through one another. support forces are always normal, or perpendicular, to the surfaces of objects
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conserved quantity
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characteristic of energy. cant be created nor destroyed but can be transferred between objects or, in the case of energy, converted from one form to another
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energy
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capacity to do work
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mechanical advantage
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the process whereby a mechanical device redistributes the amounts of force and distance that go into performing a particular amount of mechanical work
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translational motion
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overall movement of an object from one place to another
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rotational motion
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motion around a fixed point
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