Energy Equations Flashcards

1
Q

Write out the word equation for kinetic energy

A

Kinetic energy = 1/2 x mass x (velocity)^2

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2
Q

Write out the symbol equation for kinetic energy

A

Ek (subscript k) =1/2mv^2

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3
Q

Units:
for kinetic energy
mass
velocity

A

Kinetic energy in Joules - J
Mass - kg
velocity - m/s

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4
Q

Note: Write out the equation for kinetic energy

A

Always write it in words
Kinetic energy = 1/2 x mass x (velocity)^2

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5
Q

Write out the word equation for gravitational potential energy

A

Gravitational potential energy = mass x gravitational field strength x height

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6
Q

Write out the symbol equation for gravitational potential energy

A

Ep = mgh (subscript p)

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7
Q

What is the second way to write the equation for Gravitational potential energy

Write the units

A

Ep (subscript p) = W x h

Unit for weight = Newtons = N
Weight is a force
remember - m x g = W
height in metres, m

if the question asks for the equation in terms of weight write the above

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8
Q

Units for:
gravitational potential energy
mass
gravitational field strength
height

A

Gravitational potential energy in Joules - J
Mass - kg
gravitational field strength = assume10N/kg
height = metres, m

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9
Q

Write out the word equation for the elastic potential energy (in an elastic band)

A

Elastic potential energy = 1/2 x Force x extension

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10
Q

Write out the symbol equation for the elastic potential energy (in an elastic band)

A

Ee (subscript e) =1/2Fe

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11
Q

Units for
elastic potential energy
Force
extension

A

Elastic potential energy in Joules - J
Force - Newtons - N
extension - m

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12
Q

Write out the word equation for elastic potential energy (in a spring)

A

Elastic potential energy = 1/2 x spring constant x (extension)^2

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13
Q

Write out the symbol equation for elastic potential energy

A

Ee (subscript e) = 1/2ke^2 (only the extension ‘e’ that’s squared.

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14
Q

Units for
elastic potential energy
Spring constant
Extension

A

Elastic potential energy in Joules - J
Spring constant = Newtons per metre = N/m
Extension - metres - m

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