Law of Conservation of Energy

People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student rapidly rubs the palms of his hands together?

• mechanical to thermal to electrical
• chemical to mechanical to thermal
• mechanical to chemical to sound
• chemical to sound to electrical

Which of the following devices transforms electrical energy into mechanical energy?

• An e-reader
• a fan
• a manual pencil sharpener
• ipod

Which energy conversion is taking place when you put gasoline in a car?

• thermal -> electrical
• mechanical -> electrical
• chemical -> mechanical
• mechanical -> electromagnetic

According to the Law of Conservation of Energy, energy cannot be ______ or _______

• destroyed, determined

• created, nuclear

• destroyed, remade

• created,destroyed

Plants turn_______ energy into _______ energy for food.

• thermal, mechanical

• radiant, chemical

• electromagnetic, radiant

• potential, kinetic

A battery converts what type of energy to another?

• sound to kinetic

• radiant to thermal

• mechanical to electrical

• chemical to electrical

Match the following

• Mechanical Energy

• 
• Chemical Energy

• 
• Thermal Energy

• 
• Radiant Energy

• 

Tags

112.18.b.9.C

Organize these options into the right categories

Groups:

(a) Mechanical Energy

,

(b) Chemical Energy

,

(c) Elastic Potential Energy

,

(d) Radiant Energy

• Stretched Rubber Band

• Turning on a lightbulb

• The Sun

• Gasoline

• Battery

• Driving a car

• Riding a bicycle

• Sharpening a pencil

Students build a circuit that has wires that connects a battery to a switch and a fan.

Which energy transformations happen when the students close the circuit and the blades of the fan begin to spin?

• Chemical to mechanical to electrical

• Electrical to chemical to mechanical

• Chemical to electrical to mechanical

• Mechanical to electrical to chemical

Tags

112.18.b.9.C

Energy transformations occur when...

• energy is created through conduction
• energy changes from one form to another
• two forces slide together that are touching
• a chemical reaction takes place