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28 Cards in this Set
- Front
- Back
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Displacement |
VECTOR - straight line distance between two poits in a given direction |
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Velocity |
VECTOR - Rate of change of displacement |
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Speed |
SCALAR - Rate of change of distance |
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Acceleration |
VECTOR - Rate of change of velocity |
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Instantaneous values |
"rate of change" at a particular instant in time |
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Average Value |
"total dist/ total time" or equivalent |
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Free fall |
A object is in free fall if the only force acting on it is Weight |
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Terminal speed |
SCALAR- when air resistance has increased so that it cancels out the force of weight, acceleration is zero |
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Power |
SCALAR - The rate that work is done |
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Newtons 1st Law |
A body will continue in a straight line motion at constant speed or remain at rest unless aced upon by a net external force |
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Newtons 2nd Law |
Force is equal to the rate of change of momentum |
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Newtons 3rd Law |
If body A exerts a force of body B, then body B will exert an equal but opposite force on body A |
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Law of conservation of momentum |
In an isolated system with no external forces momentum is always conserved |
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Law of conservation of energy |
energy cannot be created or destroyed |
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Elastic collision |
A collison fo which kinetic energy is conserved and momentum is conserved |
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Inelastic collision |
A collison where kinetic energy is lost but momentum is conserved |
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Explosion |
When two or more particles explode apart, with a gain in kinetic energy but no change in momentum |
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Vector quantity |
has magnitude and direction |
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Scalar Quanitity |
has only magnitude |
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Systematic Error |
Every point deviates from the "correct values" by the same fixed amount |
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Random Error |
Data points differ by random amounts |
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What is the size of a subnuclear particle (m) |
10^-15 |
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What is the size of a nucleus of a hydrogen atom, diameter (m) |
10^-15 |
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What is the diameter of a hydrogen atom (m) |
10^-10 |
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What is the mass of an electron (kg) |
10^-30 |
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What is the mass of the universe (kf) |
10^+53 |
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What is the age of the universe (s) |
10^+18 |
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How long does it take for a passage of light to go across a nucleus |
10^-22 |
