Lesson: Work, Power, Kinetic and Potential Energy

Work and Power

Multiple Choice

What is the Scientific Defintion for Work?

• Joules

• A force (push or pull) that is applied to an object that causes it tp be displaced

• The amout of energy that is stored in an object due to the gravational pull of an heavier object.

• The rate at which energy is transferred or converted

Multiple Choice

8. Work is defined as:

• The product of force and displacement.

• The rate of doing work

• The energy stored in an object.

• W=F/d

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True or False: Work is done only when there is a displacement of the object.

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A force of 50 Newtons is used to lift a box vertically through a height of 4 meters. Calculate the work done.

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1. A person pushes a 20 kg box along the floor with a force of 30 Newtons for a distance of 10 meters. Calculate the work done by the person.

Multiple Choice

Power is defined as:

• The force applied to an object

• The rate of doing work

• The product of force and displacement.

• The energy stored in an object.

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The Equation of Power:

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Which of the following is the SI unit of power?

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True or False: Power is measured in joules.

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True or False: Power can never be negative.

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If a machine does 500 J of work in 10 seconds, what is its power output?

Multiple Choice

Which of the following scenarios represents the highest power output?

• Lifting a 100 kg weight 1 meter in 20 seconds

• Lifting a 10 kg weight 2 meter in 5 seconds

• Lifting a 1000 kg weight 2 meter in 20 seconds

• Lifting a 1000 kg weight 2 meter in 200 seconds

Multiple Choice

A 50 kg person climbs a flight of stairs in 20 seconds, covering a vertical distance of 5 meters. Calculate their power output.

• 1000 Watts

• 250 Watts

• 125 Watts

• 5000 Watts

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What is the conversion factor from watts to horsepower?

Multiple Choice

A light bulb consumes 60 watts of power. How much energy does it consume in 1 hour?

• 60 Watts

• 360 Watts

• 125 Watts

• 216,000 Watts

Multiple Choice

If a toaster uses 800 watts of power, what is its power output in horsepower?

• 1.07 hp

• 800 hp

• 745.7 hp

Multiple Choice

If a toaster uses 800 watts of power, what is its power output in horsepower?

• 1.07 hp

• 800 hp

• 745.7 hp

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True or False: To convert watts to horsepower, divide by 550.

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True or False: The power output of a machine can be expressed in both watts and horsepower.

Multiple Choice

Which of the following best describes kinetic energy?

• Energy associated with the motion of an object.

• Energy due to an object's mass and height above the ground.

• Energy stored in an object due to its position or configuration.

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What is the equation that is used for kinetic energy?

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True or False: An object at rest has zero kinetic energy.