Understanding Energy Concepts

What are the main types of energy?

• Magnetic, gravitational, sound

• Solar, wind, geothermal

• Kinetic, potential, thermal, chemical, electrical, nuclear, mechanical

• Biomass, hydro, fossil

Define kinetic energy and provide an example.

• A stationary bicycle, which has no kinetic energy.

• A rock at the bottom of a river, which is in motion due to water flow.

• An example of kinetic energy is a moving car, which has kinetic energy based on its mass and speed.

• A balloon filled with air, which has kinetic energy due to its internal pressure.

What is potential energy? Give an example.

• A car moving at high speed has potential energy due to its motion.

• An example of potential energy is a rock held at the top of a hill; it has gravitational potential energy due to its elevated position.

• A stretched rubber band is an example of potential energy due to its tension.

• A fish swimming in water has potential energy because it is in a liquid environment.

Name two forms of renewable energy.

• Solar energy, Wind energy

• Geothermal energy

• Hydropower

• Nuclear energy

What is mechanical energy?

• Mechanical energy is the energy associated with electrical currents.

• Mechanical energy is the energy stored in chemical bonds.

• Mechanical energy is the total energy of an object due to its motion and position.

• Mechanical energy is the energy produced by nuclear reactions.

Provide an example of mechanical energy in a car.

• The potential energy stored in the car's battery.

• The energy used to fuel the car's engine.

• The energy lost as heat during braking.

• The kinetic energy of a moving car.

How does a wind turbine convert energy?

• A wind turbine converts electrical energy into mechanical energy.

• A wind turbine converts solar energy into thermal energy.

• A wind turbine converts kinetic energy into chemical energy.

• A wind turbine converts wind energy into electrical energy.

What type of energy is stored in a compressed spring?

• Thermal energy

• Kinetic energy

• Elastic potential energy

• Chemical energy

Explain how a roller coaster demonstrates mechanical energy.

• Roller coasters operate solely on gravitational energy without any energy conversion.

• Mechanical energy is not involved in roller coasters at all.

• A roller coaster only uses kinetic energy throughout the ride.

• A roller coaster converts potential energy to kinetic energy and vice versa, demonstrating mechanical energy.

What is the difference between elastic potential energy and gravitational potential energy?

• Elastic potential energy is only relevant in vacuum conditions.

• Gravitational potential energy depends on the material's elasticity.

• Elastic potential energy is always greater than gravitational potential energy.

• Elastic potential energy is related to deformation of materials, while gravitational potential energy is related to an object's height in a gravitational field.