A type of technology in which light-sensitive materials convert sunlight into electrical energy.
A force that resists the motion between two surfaces in contact
Is a property of matter that causes it to resist changes in speed and or direction.
A way to convert energy from one form to another for many purposes
Energy is always conserved
Transfer of Energy
When energy moves from one object to another
Ex: Thermal energy is transferred from warm hands to a cold bottle
Any factor that can change in a controlled experiment, observation, or model.
Transformation of energy
Is the conversion of one energy form to another
Ex: A generator converts mechanical energy of moving water to electrical energy