Exploring Work and Power in Physics

What is the definition of work in physics?

• A transfer of energy by mechanical means

• The change in kinetic energy

• A measure of force applied over time

• The rate of doing work

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is true about work?

• It is measured in watts

• It is a scalar quantity

• It is a vector quantity

• It has both magnitude and direction

How does the work required compare when moving a stack of books together versus individually?

• It depends on the weight of the books

• The work required is the same in both cases

• Moving them together requires more work

• Moving them individually requires more work

What is the equation for work?

• Energy divided by time

• Force times distance

• Force divided by distance

• Mass times acceleration

What is the definition of power in physics?

• The rate of doing work

• The force applied over a distance

• The total energy transferred

• The change in potential energy

How is power calculated?

• Force times distance

• Work divided by time

• Mass times acceleration

• Energy times time

What is the unit of measurement for power?

• Watts

• Newtons

• Meters per second

• Joules

How do you convert watts to kilowatts?

• Multiply by 1000

• Divide by 1000

• Multiply by 10

• Divide by 10

In the practical example, what is the distance the elevator is lifted?

• 1.20 meters

• 9 meters

• 10 meters

• 15 meters

What is the power produced by the motor in the practical example?

• 7200 watts

• 7.2 watts

• 7200 kilowatts

• 7.2 kilowatts