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Related Flashcards
Cards In This Set
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A car is traveling with a constant speed round a curve in the highway. Is the acceleration of the car equal to 0 in this case?
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No, because as the car rounds the curve, the velocity changes. Since there is a change in velocity, it must have a non-zero acceleration.
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Ignoring air resistance, what is the acceleration of a falling object?
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10 meters per second per second.
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Why does a man stop accelerating downwards after opening a parachute and falling some distance?
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Air resistance produces a pull on the parachutist that is equal and opposite to the pull of gravity.
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How far can a bus travel in 6 hours at a rate of 59 mph?
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354 miles. (know how to solve and change numbers around)
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How small a time interval is needed for a good calculation of instantaneous speed to be found?
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An interval short enough that the answer won't change very much if you use a shorter one.
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What is a vector?
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Magnitude and direction.
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What did Aristotle believe about falling objects?
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The falling object's speed depends upon their weight and the medium they fall through. (He was partially correct)
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When Galileo rolled balls down several ramps and several different angles, what did he discover?
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For an fixed angle, the acceleration of an object is constant, despite its weight.
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What's the difference between mass and weight?
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Mass never changes. Weight is dependent upon gravity.
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A ball thrown vertically upwards, at the top of its path (just before it starts to fall) has what?
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An instantaneous speed of 0.
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What is the formula for impulse?
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Impulse is force multiplied by the change in time.
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