Energy
Which statement is correct about the law of conservation of energy?
Energy is transferred when atoms are rearranged.
According to the law of conservation of energy, what will most likely happen in a closed system?
Energy will be exchanged, but matter will not be exchanged.
Chemical energy in burning wood is changed into thermal energy. The thermal energy is absorbed by water, which boils to produce steam. The thermal energy is changed into kinetic energy in the moving steam. The kinetic energy is used to turn a turbine, which converts the kinetic energy into electricity. Which sentence best describes this system?
It involves both energy transformation and energy transfer.
What happens to energy when Sally kicks a soccer ball?
Kinetic energy is transferred from the leg to the soccer ball.
open system
a system that can exchange both matter and energy with its surroundings
closed system
a system that can exchange energy, but not matter, with the surroundings
work
ability to exert a force on an object over a given distance
Which is the best term to use when describing the energy of motion?
kinetic
A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher's head?
mechanical
As gravity makes an object fall down toward the ground, _______ energy becomes kinetic energy.
potential
Which energy change best relates to a boulder that is rolling down the side of a hill?
potential energy transforming into kinetic energy
joule
the SI unit of energy
energy
the ability to do work or cause change
electromagnetic energy
the energy associated with electric fields, magnetic fields, and electromagnetic radiation
kinetic energy
the energy associated with movement
Potential Energy
the energy associated with position
chemical energy
the energy stored in chemical bonds
Which statement describes thermal energy?
the energy that is associated with temperature
Thermal Energy
the kinetic energies of the molecules making up a substance; energy that can flow as heat
Law of Conservation of Energy
the law stating that energy cannot be created or destroyed, but it can change from one form to another
Mechanical Energy
the sum of the kinetic and potential energy of an object
heat
the transfer of kinetic energy between molecules as faster-moving molecules collide with slower-moving molecules; energy that flows from a warmer object or substance to a cooler object or substance
Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?
thermal energy