Energy Review

Choose the examples of potential energy from the following:

• Water at the top of a waterfall

• Battery

• Food

• Skateboard at the bottom of the steps

Which is an example of potential energy?

• A ball rolling along a sidewalk

• A glass jar sitting on a shelf

• A flag waving in the wind

• A battery powering a radio

Which statement is correct about the energy within the phase change in a closed system?

• Energy was created and destroyed

• Existing energy was destroyed

• The amount of energy remained the same

• New energy was created

Expansion joints as these are put on bridges because the concrete expands and contracts. This happens when-

• The concrete gets wet

• Chemicals get on the concrete

• The temperature changes

• The amount of light changes

What is the best definition of heat?

• Heat is the energy that is stored in the chemical bonds of molecules

• Heat is the ability of molecules to do work

• Heat is the transfer of thermal energy between substances

• Heat is the average kinetic energy of the molecules in a substance

What energy transformation takes place when you turn on an electric light?

• Mechanical- radiant +thermal

• Chemical- radiant +thermal

• Electrical- radiant + thermal

• Chemical- electrical + thermal

A burning candle is in the process of transforming-

• Chemical energy into light and heat

• Heat energy into chemical energy

• Chemical energy into nuclear energy

• Chemical energy into mechanical energy

Before modern times, people heated their homes and cooked their food with woodstoves. Food cooking in a metal pan, sitting on top of a woodstove, was heated by the following?

• Conduction, because the pan is in direct contact with the hot stove and the food is in direct contact with the pan.

• Convection, because both the pan and the food are in direct contact with the hot stove

• Radiation, because the pan is sitting directly on top of the stove

• Condensation, because the pan is sitting directly on top of the stove

Which statement is true about thermal energy and temperature during a phase change?

• During a phase change, neither thermal energy nor temperature change

• During a phase change, thermal energy changes but temperature does not

• During a phase change, thermal energy does not change but temperature does

• During a phase change, both thermal energy and temperature change

The average kinetic energy of the individual particles in a substance is the substance’s-

• Mechanical Energy

• Density

• Thermal Energy

• Temperature