WEP Flashcards
Work
The product of the displacement and the component of the force parallel to the displacement.
Gravitational potential energy
The energy an object possesses due to its position relative to a reference point.
Kinetic energy
The energy an object has as a result of the object’s motion.
Mechanical energy
The sum of gravitational potential and kinetic energy at a point.
The principle of conservation of energy
In the absence of air resistance or any
external forces, the mechanical energy of an
object is constant.
The law of conservation of energy
The total energy in a system cannot be created nor
destroyed; only transformed from one form to another.
Work-energy theorem
The work done by a net force on an object is equal to the change in the kinetic energy of the object.
Power
The rate at which work is done OR The rate at which energy is transferred.
Efficiency
The ratio of output power to input power.
One watt
The power when one joule of work is done in one second.
Momentum
The product of the mass and velocity of an object.
Momentum makes something hard to stop. (kg.m.s)
Newton’s second law in terms of momentum
The net force acting on an object is equal to
the rate of change of momentum.
Newton’s third law
When object A exerts a force on object B, object B simultaneously
exerts an oppositely directed force of equal magnitude on object A.
The law of conservation of momentum
The total linear momentum of an isolated system
remains constant.
Elastic collision
– A collision in which both momentum and kinetic energy are conserved.
