Flashcards in Chapter 5 Vocab Review Deck (24):
What’s the formula for work done by a constant force?
What is the formula for work when force and displacement are in different directions?
Define mechanical work
Work done when a force displaces an object in the direction of the force
What is the equation for kinetic energy?
What is the relationship between mechanical energy and kinetic energy known as?
Work energy principal
Define potential energy
A form of energy an object possesses because of its position in relation to forces in its environment
Define gravitational potential energy
Energy possessed by an object due to its position to the surface of earth
A designated level which objects may fall; considered to have a grav. Pot. Energy level of 0 J
How do you calculate gravitational potential energy? (The formula)
What is energy
The ability to do work
Kinetic energy is what?
Energy possessed by moving objects
What is mechanical energy the sum of?
Kinetic and grav. Pot. Energy
Define energy transformation
The change of one type of energy into another
What does the law of conservation of energy state?
When energy is changed from one form to another no energy is lost
The ratio of the amount of energy produced to the amount of energy used expressed as a percentage
What the formula for efficiency
Efficiency= Eout/Ein x 100%
Define energy resource
Energy rich substance
Define nuclear fission
The decomposition of large unstable nuclei into smaller more stable nuclei
Define nuclear fusion
A nuclear reaction in which the nuclei of two smalla tos fuse together to form a larger nucleus
Define photovoltaic cell
A device that transforms energy into electrical energy
Electricity produced by transforming the kinetic energy of rushing water into electrical energy
What is the formula for power?
The rate of transforming energy or doing work