POE - Understanding Energy, Work, and Power

Which of the following is an example of potential energy?

• A moving car

• A stretched rubber band

• A spinning wind turbine

• A glowing light bulb

What is the formula for calculating work done when a force is applied to an object?

If a student lifts a 50-pound ball 4 feet, how many Newtons of force is applied? (Use the conversion 1 N = 0.225 lb)

• 111.25 N

• 222.5 N

• 50 N

• 200 N

Which of the following is an example of kinetic energy?

• A book on a shelf

• A compressed spring

• A rolling ball

• A charged battery

What is the efficiency of a system if the input energy is 200 J and the output energy is 150 J?

• 50%

• 75%

• 100%

• 25%

Which law states that energy cannot be created or destroyed?

• Newton's First Law

• Law of Conservation of Energy

• Law of Universal Gravitation

• Ohm's Law

Calculate the power used if 271 J of work is done in 5 seconds.

• 54.2 W

• 54.3 W

• 55 W

• 50 W

What type of energy transfer occurs when sunlight is converted into energy for plant growth?

• Electrical to Thermal

• Chemical to Kinetic

• Thermal into Chemical

• Mechanical to Electrical

Which of the following is a form of potential energy?

• Thermal energy

• Electrical energy in a moving conductor

• Chemical energy in fuel

• Kinetic energy of a moving car

What is the formula for calculating power in terms of work and time?