Energy

Which statement describes thermal energy?

Energy that is associated with temperature

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.

A generator contains a coil that spins to produce an electric current. How is energy transformed by using a generator?

Mechanical energy is transformed to electromagnetic energy.

Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb?

chemical energy to electromagnetic energy and thermal energy

In a chemical reaction occurring in an open beaker, the reactants have a mass of 10.0 g and contain 1000 J of energy. The products in the beaker contain a mass of 5.0 g and 500 J of energy. Which best explains the difference in energy and mass as reactants are converted to products?

law of conservation of energy

What type of energy is the sum of an object's potential and kinetic energy?

mechanical energy

Which is the best term to use when describing the energy of position?

potential

Which energy change best relates to a boulder that is rolling down the side of a hill?

potential energy transforming into kinetic energy

Which form of energy is directly related to the measure of the average kinetic energy of the particles in a substance?

thermal energy