# G484 Definitions

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• Created by: huyzie
• Created on: 19-06-13 20:24
Linear Momentum
Product of its mass and its velocity (p = mv)
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Closed System
No external forces; momentum is conserved
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Principle of Conservation of Momentum
When bodies interact, their total momentum is constant (no external forces)
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Newton's First Law
Object continues in state of rest/uniform motion unless acted on by a net force
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Newton's Second Law
When net force acts on object, rate of change of momentum = force producing it, in direction of that force
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Newton's Third Law
When two objects interact, forces they exert on each other are equal in magnitude but act opposite directions
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Impulse
Change in momentum (force x time)
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Kepler's Third Law
The square of period T is proportional to the cube of the radius of orbit
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Geostationary Orbit
Time period of 24h, orbit above the equator and move in same direction as rotation of Earth
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Displacement
Distance of mass from its equilibrium position
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Amplitude
Greatest value of displacement
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Period
Time for one complete oscillation
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Frequency
Number of oscillations per second
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Simple Harmonic Motion (SHM)
When the acceleration of a mass is directed towards a fixed point and is proportional to its displacement from that point
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Light Damping
Amplitude decreases gradually as mass oscillates
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Critical Damping
Damping heavy enough for displacement to decreases to zero without oscillation
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Internal Energy
Sum of random distribution of KE and PE of the system
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Melting
PE increases; KE decreases
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Boiling
PE increases; KE is consant
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Evaporation
More energetic molecules escape; mean KE of molecules in liquid decreases. Temperature drops
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## Other cards in this set

### Card 2

#### Front

No external forces; momentum is conserved

Closed System

### Card 3

#### Front

When bodies interact, their total momentum is constant (no external forces)

### Card 4

#### Front

Object continues in state of rest/uniform motion unless acted on by a net force

### Card 5

#### Front

When net force acts on object, rate of change of momentum = force producing it, in direction of that force