Work, Energy, and Power Flashcards
What is the definition of energy?
Energy is the capacity to do work.
What are the two main types of energy?
Potential energy and kinetic energy.
What is the difference between potential energy and kinetic energy?
Potential energy is stored energy due to an object’s position, while kinetic energy is the energy an object has due to its motion.
What are some examples of potential energy?
Gravitational, chemical, nuclear, and elastic energy.
What is the formula for gravitational potential energy?
PotentialEnergy=mass×gravity×height
How is work defined in thermodynamics?
Work is the energy transferred by the system to its surroundings.
Under what conditions is work done on an object?
Work is done when a force acts upon an object and causes it to be displaced.
What is the definition of power in physics?
Power is the amount of work done over time or how fast work is done.
What is the formula for calculating kinetic energy?
KineticEnergy
1
2
×
mass
×
velocity
2
KineticEnergy=
2
1
×mass×velocity
2
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed; it may only be transferred from one form to another, but the total amount of energy remains unchanged.
What is the difference between evaporation and boiling?
Evaporation occurs at any temperature and only on the surface, while boiling occurs throughout the liquid at a specific temperature.
What happens during condensation?
Condensation is the change of gas to liquid that occurs at the surface, which is a warming process as heat is added to the environment.
What is the formula for power in terms of force and velocity?
Power=Force×velocity
What does it mean when work is done against another force?
It means that the force applied is used to overcome another force, such as friction or gravity.
What is the formula for calculating work?
Work=Force×Distance
What is the significance of potential energy?
Potential energy is significant only when it changes, meaning when it does work or transforms into another form of energy.
What determines the amount of kinetic energy an object has?
The kinetic energy of an object depends on its mass and its velocity.
How does the speed of an object affect its kinetic energy?
If the speed of an object is doubled, its kinetic energy increases by a factor of four (since kinetic energy is proportional to the square of velocity).
How is work related to energy transformation?
Work is done when energy is transformed from one form to another.
