Simple Machines: Power

The video tutorial explains the concept of power by comparing the power of oxen and a tractor in plowing a field. It defines power as the rate at which work is done and introduces the mathematical formula for power: work divided by time. The tutorial further explains that power is measured in joules per second, also known as Watts, and provides practical examples to illustrate the concept, such as lifting a glass of water or the operation of a 100 Watt light bulb.

Which of the following statements best describes power in the context of the oxen and the tractor?

• Power is the energy stored in a system.

• Power is the total amount of work done.

• Power is the speed at which work is completed.

• Power is the force applied to do work.

What is the formula for calculating power?

• Power equals force times distance.

• Power equals energy divided by force.

• Power equals work divided by time.

• Power equals work times time.

What is the unit of power known as?

• Newton

• Meter

• Watt

• Joule

How much power is required to lift a glass of water one meter in one second?

• One Joule

• One Newton

• One Meter

• One Watt

A 100 Watt light bulb consumes power at what rate?

• 100 Joules per second

• 100 Watts per hour

• 100 Newtons per second

• 100 Joules per minute