Energy Review

Electrical -> Mechanical -> Sound 

• A triple beam balance measuring an object’s mass
• A pencil sharpener plugged into a wall outlet
• A projector displaying a diagram on the screen
• A working flashlight used to light up a dark corner

Which of these is an example of light energy being transformed into chemical energy?

• A glow stick lights up when broken.
• Water heated by the sun evaporates.
• A plant makes sugar in the sunlight.
• A battery causes a buzzer to vibrate.

Conduction can only occur between two objects when –

• one object is less dense than the other.
• both objects are in physical contact with each other.
• one of the objects is made of a metal.
• both objects are exactly the same temperature.

What is an advantage of using natural gas as an alternative form of energy?

• More needs to be burned because it is less concentrated 
• There is a limited supply 
• It tends to be more expensive compared to other fossil fuels
• It releases lower emissions compared to other fossil fuels

Which kind of energy change occurs when a candle is burning?

• Chemical to light
• Light to electrical
• Solar to heat
• Chemical to electrical

Radiation refers to the transfer of heat energy that moves –

• only through solids.
• through empty space.
• when objects touch.
• in the motion of fluids.

One disadvantage to using coal to produce electricity is that coal -

• forms in a short amount of time.
• is abundant over a wide area.
• is not environmentally friendly.
• is relatively quite affordable.

What is a major disadvantage of using nuclear power to generate electricity?

• A small amount of power is produced
• No greenhouse gases are produced
• The power plants are inexpensive to build
• The by-product of nuclear power is radiation
  

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• When heat transfers from objects that are touching.
• When heat transfers through the heater or AC in your house.

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NGSS.MS-PS1-4

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 

• Both the potential energy and kinetic energy decrease
• The potential energy decreases while the kinetic energy increases 
• The kinetic energy decreases while the potential energy increases 
• Bothe the potential energy and kinetic energy increase