Rainbow Mind Map: Work, Power and Energy
Work, Power & Energy
Work
Definition
Work is done when a force causes displacement
Positive & Negative Work
Work can be positive or negative depending on angle between force and displacement
Units of Work
1 Joule = 1 Newton × 1 Meter
Power
Definition
Power is the rate of doing work
Units of Power
1 Watt = 1 Joule per second
Average vs Instantaneous
Power can be measured over time or at an instant
Energy
Definition
Energy and work have the same units
Units of Energy
1 calorie = 4.184 Joules
Energy Transfer
Energy moves from hotter to colder objects
Kinds of Energy
Kinetic Energy
Depends on mass and velocity
Potential Energy
Gravitational, elastic, chemical, etc.
Other Forms
Many specialized forms of energy
Law of Conservation of Energy
Statement
Fundamental law of physics
Implications
Energy just changes forms
Applications
Powerful problem-solving tool
Dissipation of Energy
Definition
Often appears as heat
Causes
Non-conservative forces
Effects
Leads to entropy increase
Examples of Inter-conversion
Pendulum
Continuous conversion between forms
Battery & Bulb
Multiple energy transformations
Power Plant
Complex energy conversion chain
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