Chapter 2.3 Flashcards
Principle of conservation of energy
Energy is not created or destroyed but is only transformed from one form into another
Work done by a force definition and formula
The product of the force in the direction of the displacement times the distance travelled
W = Fscos(theta)
Centripetal force
A force directed toward the center of the circle in circular motion
What does the area under a force against distance graph show?
The work done by a force
Kinetic energy formula
KE = 0.5mv^2
Work-kinetic energy relation
The work done goes into changing the kinetic energy
Work done to extend a spring formula
W = 0.5kx^2
True or false? The work done by gravity is dependent of the path followed
False, path followed is not important
What does work done by gravity depend on?
The vertical distance separating the initial and final positions
Conservative forces
A class of forces where the work done is independent of the path followed
Potential energy
The energy of a system due to its position or shape and represents the work done by an external agent in bringing the system to that position or shape
Elastic potential energy definition and formula
The work done by the pulling force in stretching the spring by an amount x
PE = 0.5kx^2
Gravitational potential energy definition and formula
The work done by the moving force in placing a body a height h above its initial position
PE = mgh
When will there be a transfer of heat?
When a system is in contact with surroundings at a different temperature
When is a system isolated in terms of energy?
Q + W = 0
