Moran Energy Unit Review

Megan’s kitty Moe laid by the fire without burning its fur. He stays by the fire to keep warm. What type of heat transfer did Moe the kitty experience? 

• radiation
• conduction
• insulation
• all of the above

Magnets and electromagnets can both be used to pick up metal items like iron nails. Even though they are similar, there are differences between magnets and electromagnets. An example of one of these differences is that 

• magnets require an electric current to work.
• electromagnets require an electric current to work. 
• magnets will stick to your refrigerator while electromagnets will not.
• electromagnets will stick to your refrigerator while magnets will not.

The main source of energy for our planet is/are 

• the sun.
• the earth’s core.
• greenhouse gases. 
• cosmic background radiation.

 View Illustration A: Levers above. If each lever is used to lift the same box up onto a table one meter above the floor. Which of the following answers is correct. 

• Lever A will require more work.
• Lever B will require more work.
• Lever A will require more force.
• Lever B will require more force.

Conduction occurs more easily between solids and liquids. This is because the particles in gases are 

• further apart and move faster.
• closer together and move faster.
• further apart and move more slowly.
• closer together and move more slowly.

A nuclear power plant, a hydroelectric dam, and a coal burning power plant have what in common? 

• They are all sources of fuel. 
• They are all sources of electricity. 
• They are all sources of natural resources. 
• They all turn solar energy into chemical energy.

Within the alarm clock seen above (plugged into an outlet), energy is transformed. It’s time to get up! The alarm clock goes off. What are the energy transformations that take place within the alarm clock? 

• electrical --> heat  --> sound
• electrical  --> light  --> sound
• electrical  --> chemical  --> light
• chemical  --> electrical  --> mechanical

Mrs. Everhart and her son Jonathan build an electromagnet (above) by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up six paperclips. Mrs. Everhart wants Jonathan to be able to pick up at least ten paperclips. What can he do to increase the number of paperclips that the electromagnet picks up?

• Make the wire longer.
• Remove the nail from the center of the wire.
• Increase the number of loops of wire around the nail.
• Spread the loops of wire apart on the nail so that they do not touch.

We can get a sun tan through the process of 

• conduction
• convection
• radiation
• stratification

Which statement best summarizes the law of conservation of energy? 

• When work is done, energy is lost.
• Heat flows from a warm body to a cold body.
• Energy can't be lost or destroyed, it can only change into another kind of energy.
•  The fewer number of grams the more energy it would have.