Work and Energy Flashcards
Define work
The displacement of an object when a force is applied to it
What is the equation for work done?
U = Fs
What is work measured in?
Joules (Nm)
What is the equation for weight?
W=Ma(grav)
F=Ma
Define displacement
The linear distance an object has moved from its starting position
Define positive work
When the displacement is in the same direction as the force
What are the types of contractions used during positive work?
Concentric - muscle shortens
Define negative work
When the displacement is in the opposite direction as the force
What are the types of contractions used during negative work?
Eccentric - lengthening of the muscle during contraction
Define zero work
When the object begins at its starting position there for these is no displacement
What are the types of contractions used during zero work?
Concentric and eccentric
What are the types of mechanical energy? (2)
Kinetic energy
Potential energy
Define kinetic energy
The energy an object possesses due to its motion
what are the 2 types of potential energy?
Strain energy
Gravitational energy
Define strain potential energy
Energy due to deformation of an object
