TED-Ed: How does workwork? - Peter Bohacek

The video tutorial explains the concepts of work and power in physics. Work is the energy transferred into or out of a system, measured in joules. An example using a grandfather clock illustrates how work is calculated by multiplying force and distance. Power, the rate of energy transfer, is measured in watts. The tutorial discusses James Watt's contribution to the concept of horsepower and compares the power needed to run a clock versus a 100-watt light bulb. It concludes with a calculation of the clock's power usage over five days, highlighting the efficiency of energy use.

What is the unit of measurement for work and energy in the metric system?

• Newtons

• Joules

• Watts

• Horsepower

How is power defined in physics?

• The total energy in a system

• The rate of energy transfer

• The force applied over a distance

• The potential energy stored

Who is the unit of power, the Watt, named after?

• James Watt

• Albert Einstein

• Isaac Newton

• Nikola Tesla

If it takes 60 seconds to wind a clock, how much power is used if 150 joules of work is done?

• 1.5 watts

• 2.5 watts

• 4.5 watts

• 3.5 watts

How much power does the grandfather clock use over 5 days?

• 35 watts

• 0.35 milliwatts

• 35 milliwatts

• 0.35 watts