Law of Conservation of Energy

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved
• The total amount of energy is less after a reaction
• The total amount of energy is more after a reaction

Which energy transformation below matches?
A book falling?

• chemical to sound and heat
• kinetic to sound and heat
• electrical to sound and heat

Which energy transformation below matches?
Water moving over a dam to move a generator?

• kinetic to chemical
• kinetic to electrical
• solar to electrical

Which energy transformation below matches?
Green plants?

• chemical to mechanical
• chemical to heat
• solar to chemical

Which energy transformation below matches?
Animals eating food?

• electrical to potential
• chemical to kinetic
• potential to chemical

Which energy transformation below matches?
An electrical circuit?

• chemical to heat, sound, light, mechanical
• solar to heat, sound, light, mechanical
• electrical to heat, sound, light, mechanical

Potential or kinetic?
Stretched bow and arrow?

• kinetic
• potential

Potential or kinetic?
Running?

• potential
• kinetic

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• mechanical to heat

• sound to mechanical

• potential to kinetic

• kinetic to potential

What energy transformations are occurring in this picture?

• gravitational potential --> sound --> thermal

• chemical potential --> mechanical --> elastic potential --> gravitational

• electrical --> sound --> thermal --> radiant

• chemical potential --> radiant --> thermal