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30 Cards in this Set
- Front
- Back
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What were the five measurements made by the Greeks?
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Size of the Earth, Size of the Moon, Distance to the Moon, Distance to the Sun, Size of the Sun
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What is the scientific method?
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Recognize the question, make hypothesis, predict the consequences, perform experiments, formulate rule from data
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What is a law?
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A thoroughly tested hypothesis
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What is a scientific theory?
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A well-tested hypothesis encompassing vast amounts of research and knowledge. A theory can evolve and change with added data
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What must a scientific hypothesis be capable of?
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It must be able to be proven both right and wrong, or else it is not scientific
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What is a pseudoscience? Give an example
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It is a false science with a base in some facts, but it makes unreasonable and unscientific assumptions. An example is horoscopes and reading the stars
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Why is physics called "the basic science"?
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Because it deals with the most basic parts of science. Its topics serve as the base for all other science
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What is Newton's first law of motion?
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An object at rest stays at rest, and an object in constant motion stays in constant motion unless acted upon by a net force
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What is inertia?
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The property of an object to resist changes in motion
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What is a force?
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A push or a pull
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What is support force?
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An upward force that supports an object at an equal rate to the force of gravity
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If an object is in equilibrium, does that mean it is at rest?
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Not necessarily, it just means that it has no net force, meaning that it is either at rest or moving at a constant rate.
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How many sig figs does 0.02 have?
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One
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How many sig figs does 5.00 have?
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3
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What does N represent for units?
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kgm/s2
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How do you find average speed?
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Total distance/time traveled
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What is the difference between speed and velocity?
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Velocity has direction
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What is the formula for acceleration?
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Change in velocity/time
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Does acceleration include direction?
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Yes, because it uses velocity
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What is free fall?
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When an object is falling with only the force of gravity as a force. No air friction
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What is the equation for the velocity of an object in free fall?
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velocity= 9.8 m/s2 * time
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What does g equal?
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9.8 m/s2 or acceleration due to gravity
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How do you calculate distance in free fall?
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distance= 1/2 (gt2)
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Does d=1/2(gt2) find all distances?
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No, it only works in free fall
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What is net force directly proportional to?
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acceleration
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What is mass?
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The amount of matter in an object
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What is weight?
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The force upon an object due to gravity
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How does mass relate to acceleration?
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Acceleration is inversely proportional to mass
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What is another formula for determining acceleration?
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a= Net force/mass
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What is Newton's Third Law?
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Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first
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