Energy Concepts Unit 1.4 Flashcards
define Work?
Force multiplied by the distance moved in the direction of the force
equation for work?
Work = Force x Distance x cos(0)
or if no angle…
W = Fx
Energy transfer is equal to the…
Work Done
Define Kinetic Energy?
Energy possessed by an object due to motion (because its moving)
Define Gravitational Potential Energy?
Energy possessed by an object due to its height.
2 Things to consider about G.P.E
- No obvious place where GPE is 0
- GPE can be negative- anything below ground level
Define Elastic Potential Energy?
Energy possessed by an object due to its deformation (stretched, squashed, bent)
What does the Area under the graph represent on a F-X graph
Work Done
Equation that links Force Spring constant and distance stretched
F=kx
Equation of Work Done in stretching of a spring which obeys hooke’s law
W = 1/2 Fx
State the Law of Conservation of energy?
Energy cannot be created or destroyed but only transferred
Define power?
Rate of energy transferred (W)
Define dissipative forces?
forces which lead to loss of mechanical energy in a system
Define internal energy
sum of all Kinetic and potential energies of particles in a system.
Define efficiency?
Fraction of the input energy which is usefully transferred.
