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15 Cards in this Set
- Front
- Back
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Physics is...
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mathematical representation of the physical world
done by experimentation fundamental explanations of matter, space, and time |
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The language of physics is
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mathematics
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Force
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a push or a pull
an interaction between two forces, on exerting on each of the two interacting objects always occur in pairs |
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Goal of Physics
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to write all forces in some universal law, called unification
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Four fundamental forces:
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Gravity
Electromagnetism Strong force Weak force |
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Gravity
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weakest force, limited range
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Electromagnetism
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strong force, unlimited range
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Strong force
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nuclear force, strongest force, very short range (holds atoms together)
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Weak force
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nuclear force, weak force, shortest range, responsible for some form of radioactive decay
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Forces on macroscopic objects are either ______________, _____________, or ______________ forces.
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Gravitational, electromagnetic (both long-range fundamental forces) or contact forces
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Contact forces exist only as long as
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the objects are touching each other
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Newton's First Law
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An object remains at rest or in constant velocity motion unless acted upon by a NET force.
Also called the Law of Inertia. |
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Inertia
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The tendency of an object to resist changes in motion, measured by mass (not weight, b/c inertia is still there without a gravitational pull)
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Translational Equilibrium
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when the net force on an object is zero, the object is said to be in this state
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Newton's Third Law
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Forces always occur in pairs, and in any system, internal interactions result in a net force of zero (meaning that in interactions, an object with a force of magnitude x will have an interaction partner with a force of magnitude x in the opposite direction).
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