Understanding Concepts and Energy

What is the definition of energy?

• Energy is the capacity to do work or produce change.

• Energy is a type of matter.

• Energy is a form of heat.

• Energy is the speed of light.

Name two forms of energy.

• Kinetic energy, Potential energy

• Thermal energy

• Nuclear energy

• Chemical energy

What is the law of conservation of energy?

• Energy cannot be created or destroyed, only transformed.

• Energy can only be created from matter.

• Energy can be created and destroyed.

• Energy is always lost in transformations.

How does kinetic energy differ from potential energy?

• Kinetic energy can be stored in a compressed spring.

• Kinetic energy is always greater than potential energy.

• Kinetic energy differs from potential energy in that kinetic energy is associated with motion, whereas potential energy is associated with position or configuration.

• Potential energy is only found in moving objects.

Give an example of a situation where energy is transformed.

• A battery storing energy without any discharge.

• A light bulb converting electrical energy into light energy.

• A car converting fuel into kinetic energy.

• A solar panel absorbing sunlight without generating electricity.

What unit is used to measure energy?

• meters

• liters

• joules

• grams

Explain how energy can be transferred from one object to another.

• Energy can be transferred through conduction, convection, radiation, and mechanical work.

• Energy transfer is impossible between solid objects.

• Energy can only be transferred through chemical reactions.

• Energy can only be stored, not transferred.

What is renewable energy? Give two examples.

• Solar energy and wind energy.

• Nuclear energy and geothermal energy

• Hydroelectric energy and fossil fuels

• Natural gas and coal energy

How does friction affect energy in a system?

• Friction increases energy by converting thermal energy into mechanical energy.

• Friction reduces energy in a system by converting mechanical energy into thermal energy.

• Friction only affects potential energy, not mechanical energy.

• Friction has no effect on energy in a system.

Describe the relationship between work and energy.

• Energy cannot be transferred through work.

• Work is the same as energy.

• Work is the transfer of energy; doing work increases energy in an object, while energy transfer decreases it.

• Doing work decreases the energy in an object.