All Flashcards
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, only transformed.
Define a 'closed system' in thermodynamics.
A system that exchanges energy, but not matter, with its surroundings.
Define an 'open system' in thermodynamics.
A system that exchanges both matter and energy with its surroundings.
Define 'work' in physics.
The transfer of energy that occurs when an external force moves an object parallel to the force.
Define 'power' in physics.
The rate at which work is done or energy is transferred.
What is internal force?
Force caused by a member within the system.
What is external force?
Force caused by something outside the system.
What are the differences between an open and a closed system?
Open System: Exchanges both matter and energy. | Closed System: Exchanges energy, but not matter.
What are the differences between positive and negative work?
Positive Work: Work done on the system, increasing its energy. | Negative Work: Work done by the system, decreasing its energy.
Differentiate between internal and external forces.
Internal Force: Force exerted by an object within the defined system. | External Force: Force exerted on the system by an object outside of it.
What is the difference between work and power?
Work: The transfer of energy. | Power: The rate at which work is done.
In the Work diagram, what do F, d, and θ represent in the equation ?
F: Force applied, d: Distance over which the force is applied, θ: Angle between force and distance vectors.