2.6 Work, Energy And Power Flashcards
What is work done?
For a constant force and motion along a straight line the work done by this force is the product of the magnitude and the distance travelled in the direction of the force W=Fdcos@ where @ is the angle between the force and the direction of motion. Work is a scalar quantity.
What is energy?
The ability to do work.
What are some forms of mechanical energy?
Kinetic energy
Gravitational potential energy
Elastic potential energy
Total mechanical energy.
What is conservation of energy?
Total energy cannot be created or destroyed it only gets transformed from one form into another. In a system where no frictional or other dissipative forces act the total mechanical energy stays the same. If forces do act then mechanical energy gets transformed into other forms of non mechanical energy. The work done by these forces is the change in the total mechanical energy of the system.
What is an elastic collision?
A collision in which the total kinetic energy before and after the collision are the same.
What is power?
The rate at which a force works, or the rate at which energy is consumed, produced or dissipated, that is P = delta W/delta t. Power is measures in watts or joules per second.
What is the work kinetic energy relation?
The work done by the net force on a body is equal to the change in the body kinetic energy Went = delta Ek
