Exploring Energy Transformation Concepts

What does the law of conservation of energy state?

• Energy is always lost in transformations.

• Energy can be created and destroyed.

• Energy can only be converted to heat.

• Energy cannot be created or destroyed, only transformed.

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When a cannon is fired, what type of energy is initially involved?

• Thermal energy

• Mechanical energy

• Chemical energy

• Radiant energy

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What happens to the kinetic and potential energy of a projectile at the top of its arc?

• Both kinetic and potential energy are at their maximum.

• Kinetic energy is at its minimum, potential energy is at its maximum.

• Kinetic energy is at its maximum, potential energy is at its minimum.

• Both kinetic and potential energy are at their minimum.

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Which process converts radiant energy into chemical energy?

• Photosynthesis

• Combustion

• Respiration

• Digestion

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What is the sum of kinetic and potential energy in a system called?

• Thermal energy

• Mechanical energy

• Chemical energy

• Radiant energy

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How is mechanical energy transformed when a swing moves?

• It is destroyed.

• It is converted into thermal energy due to friction and air resistance.

• It remains constant.

• It is converted into electrical energy.

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What type of energy transformation occurs in a hair dryer?

• Radiant to chemical

• Mechanical to thermal

• Electrical to thermal

• Chemical to mechanical

Why does a car engine get hot when running?

• Electrical energy is converted into thermal energy.

• Chemical energy is converted into thermal energy.

• Radiant energy is converted into thermal energy.

• Mechanical energy is converted into thermal energy.

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What is power defined as in terms of energy?

• The rate at which energy is converted.

• The potential energy in a system.

• The amount of energy lost in a system.

• The total amount of energy used.

How many joules are approximately in one calorie?

• 4000 joules

• 3000 joules

• 2000 joules

• 1000 joules