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18 Cards in this Set
- Front
- Back
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Physics |
The study of physical actions of nature |
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Scientific method |
Observe: look Formulate hypothesis: pass judgment Experiment: look again Data: write it down Conclusion: pass judgment on original judgment Publish: peer influence/perspective- validation |
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Science |
Mankind's attempt to understand how nature works |
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Physical measurement: |
Number & unit of measure E.g. mass of 10 kg |
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Standardized system of units |
System International- S.I. units Metric-based: meters, grams, seconds |
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Eratosthenes |
C. 200 BC Determines size of earth with stick and a camel |
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Aristarchus |
Determines size of moon compared to earth. 3.5x smaller moon diameter, about 1/4 earth. |
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Aristotle |
4th century bce Earth-solid Water-liquid Air-gas Fire-plasma (change) Natural motion: return to earth (gravity)- no observable cause Violent motion: observable cause |
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Galileo |
All bodies accelerate toward earth equally, independent of mass All bodies, once placed on motion, tend to remain in motion (inertia) |
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g of earth |
The rate of acceleration due to gravity near earth. |
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Newton's first law |
Inertial law Bodies maintain a constant state of motion unless acted upon by a net force. (Straight path, constant speed) |
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Force |
Push or pull Unit= Newton (N) |
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Net force |
Combination of all the forces that act on an object Sum of Forces -Fa + Fb |
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Equilibrium |
A condition whereby an object maintains a constant state of motion. Can occur for objects in motion or at rest. EF= 0 2 or more forces must act on object, must move steadily and not change direction |
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Dynamic equilibrium |
Steadily rolling in straight path |
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Static equilibrium |
At rest |
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Inertia |
The property of things to resist changes in motion. |
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The reason an object maintains a state of motion |
Absence of a net force acting on it |
