Understanding Energy, Work, and Power

Mr. Anderson explains energy, work, and power. Energy is the ability to do work, which is force times distance, measured in joules. He uses a can of Coke to illustrate work and power, showing how power is work over time, measured in watts. He also discusses horsepower, a unit of power used in engines, and its conversion to watts.

Which of the following is NOT considered a form of energy?

• Light

• Electricity

• Sound

• Gravity

In scientific terms, how is work defined?

• Energy times time

• Force times distance

• Force divided by distance

• Energy divided by time

What unit is used to measure work?

• Watts

• Newtons

• Horsepower

• Joules

If a can of Coke weighing 4.0 Newtons is moved up 3.0 meters, how much work is done?

• 7 Joules

• 12 Joules

• 15 Joules

• 10 Joules

What is the power output if 12 Joules of work is done in 1 second?

• 6 Watts

• 12 Watts

• 24 Watts

• 3 Watts

How does the power output change if the same work is done in 10 seconds instead of 1 second?

• Remains 12 Watts

• Increases to 24 Watts

• Increases to 15 Watts

• Decreases to 1.2 Watts

What is the conversion factor from watts to horsepower?

• 1 horsepower = 1000 watts

• 1 horsepower = 746 watts

• 1 horsepower = 250 watts

• 1 horsepower = 500 watts

If a task requires 12 Watts of power, how much horsepower is being used?

• 0.4 horsepower

• 0.016 horsepower

• 0.8 horsepower

• 1.6 horsepower

What additional factor should be considered when calculating the power of moving a can of Coke up stairs?

• The speed of movement

• The weight of the can

• The height of the stairs

• The weight of the person

Which unit is commonly used in the US to measure engine power?

• Newtons

• Horsepower

• Watts

• Joules