Physics: Work, Energy and Power

energy

the capacity or ability to do work

work

the product of the component of a force along the direction of displacement and the magnitude of displacement

kinetic energy

Energy of motion; the energy available as a result of the motion of a body.

potential energy

stored energy; energy associated with an object due to its position, shape, or condition

conservation

energy can only be transferred not elimated, is the law of ________ energy

mechanical energy

the sum of kinetic and all forms of potential energy

power

The rate at which work is done over time

joule

unit of work or energy

watt

unit of power

gravitational potential energy

potential energy that is stored in the gravitational fields of interacting bodies

elastic potential energy

the energy available for use when a deformed elastic object returns to its original configuration

scalar

What type of quantity are work and power?

0 J

A young lad carries a small bucket of water that weight 1 N to his firefighter dad with a constant velocity for 4 m/s. How much work did he do?

spring constant

a parameter that is a measure of a spring’s resistance to being compressed or stretched

true

T or F; total energy is always conserved.

work-kinetic energy theorem

the net work done by all the force acting on an object equal to the change in the object’s kinetic energy

negative work

the product of when force and displacement are in opposite directions, resulting in a decrease in energy.

positive work

the product of when force and displacement are in the same direction, resulting in an increase in energy