Energy Flashcards

1
Q

State the conservation of energy

A

Energy cannot be created or destroyed. It can only be changed from one form into another.

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2
Q

Forms of energy

A
Kinetic 
Heat
Chemical
Potential
Light 
Nucleur
Electrical
Sound
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3
Q

What is the most common type of wasted energy?

A

Heat energy

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4
Q

Gravitational field strength

A

The gravitational field strength is the force of gravity acting on 1kg of mass.

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5
Q

What happens when the force of friction acts?

A

When the force of friction acts, kinetic energy is converted into heat energy. Heat is often a wasted form of energy.

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6
Q

Work done formula (object moved horizontally by a force)

A

Ew = Fd

Ew = work done (J)
F = force (N)
d = distance (metres)
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7
Q

Potential energy formula

A

Ep = mgh

Ep = potential energy (J)
m = mass (kg)
g = gravitational field strength (9.8 Nkg-¹)
h = vertical height (metres)
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8
Q

Kinetic energy formula

A

Ek = 1/2 mv²

Ek = kinetic energy (J)
m = mass (kg)
v² = speed (ms-¹)
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9
Q

Formula for falling objects

A

Ek gained = Ep lost

1/2 mv² = mgh

(Mass cancels out)
(Assuming no energy lost to heat due to air resistance)

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