Elastic Potential Energy

Learning objectives:

• Define elastic potential energy and describe factors that affect elastic potential energy
• .Calculate energy problems using the correct equations
• Rearrange energy equations and convert units when calculating energy problems

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Key Vocabulary:

Chemical energy

Kinetic energy

Gravitational potential energy

Thermal energy

Elastic potential energy

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Starter 1

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Define Work in physics

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Starter 2

What is the work done when you move an object with a force of 5N through a distance of 10m?

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Starter 3

What Force was used when an object moved 15m and transferred 60J of energy?

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Challenge:

What is the definition of elastic potential energy?

Elastic Potential Energy

Learning objectives:

• Define elastic potential energy and describe factors that affect elastic potential energy
• .Calculate energy problems using the correct equations
• Rearrange energy equations and convert units when calculating energy problems

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Key Vocabulary:

Chemical energy

Kinetic energy

Gravitational potential energy

Thermal energy

Elastic potential energy

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Starter 1

W=Fxd

• Work done is the amount of energy transformed by a FORCE moving an object through a DISTANCE

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Starter 2

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W=Fxd

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=5Nx10m=

50J

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Starter 3

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F=W/d

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60J/15m

=4N

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Challenge:

Elastic potential energy is energy stored as a result of applying a force to deform an elastic object.

Elastic potential energy

What is the definition?

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What factors (things) do you think will affect the amount of elastic potential energy?

• Elastic potential energy is a stored type of energy.
• The further an object is extended (stretched), the more elastic potential energy it has.
• The spring constant is how stiff or difficult the object is to stretch
• If object A has a higher spring constant, and is stretched to the same extension as object B with a lower spring constant, object A will have more elastic potential energy.

Key words – Stored, elastic potential, stretched, further, spring constant, stiff

Elastic potential energy:

Elastic potential energy equation

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J

m

N/m

Write down the answer AND how you worked it out:

Tia stretched a band to an extension of 2m which has a spring constant of 12N/m. What is the elastic potential energy of the band?

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Show all working out!

Write down the answer AND how you worked it out:

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Sean stretched a spring which has a spring constant of 5N/m to an extension of 1.2m. What is the elastic potential energy of the spring?

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Show all working out!

Write down the answer AND how you worked it out:

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A stretched a spring is storing 9000J of elastic potential energy. It has a spring constant of 10 N/m to an extension of ??????.

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Show all working out!

Complete Elastic potential energy questions

Self assess with a mark scheme.

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ADD CORRECTIONS in purple and get it stamped

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Super challenge question - If an elastic band, with a mass of 0.12kg is stretched to and extension of 0.5m and has a spring constant of 5N/m then is let go so it flies away; what velocity does it travel at? Assume this is a perfect system and no energy is lost to the surroundings.

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Research Hooke’s law and how it related to elastic potential energy

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Research Hooke’s law and how it related to elastic potential energy

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Answer here:

Elastic energy of a force graph???