Understanding Work, Power, and Energy

What is the formula for work done?

• Work = Force - Distance

• Work = Force × Distance × cos(θ)

• Work = Force / Distance

• Work = Force + Distance

Define power in terms of work and time.

• Power = Work - Time

• Power = Work / Time

• Power = Time / Work

• Power = Work + Time

How is energy related to work?

• Energy can be created from nothing.

• Work is not related to energy.

• Energy is the same as power.

• Energy is the capacity to do work.

What unit is used to measure work?

• joule

• watt

• pascal

• newton

If 50 Joules of work is done in 5 seconds, what is the power?

• 20 Watts

• 10 Watts

• 5 Watts

• 15 Watts

What is the SI unit of power?

• watt

• joule

• ohm

• volt

Explain the concept of kinetic energy.

• Kinetic energy is the energy required to lift an object against gravity.

• Kinetic energy is the energy of an object in motion, calculated as KE = 1/2 mv^2.

• Kinetic energy is the energy released during a chemical reaction.

• Kinetic energy is the energy stored in an object at rest.

What is potential energy? Give an example.

• A car moving at high speed.

• An example of potential energy is a rock positioned at the top of a hill.

• A balloon filled with air.

• A fish swimming in water.

How do you calculate gravitational potential energy?

• GPE = g * h / m

• GPE = m * h / g

• GPE = m + g + h

• GPE = m * g * h

What is the work-energy theorem?

• The work-energy theorem states that energy cannot be created or destroyed.

• The work-energy theorem relates the work done on an object to its change in kinetic energy.

• The work-energy theorem is unrelated to forces acting on an object.

• The work-energy theorem applies only to objects at rest.