energi

What is kinetic energy and how is it calculated?

• Kinetic energy is the energy of an object at rest.

• Kinetic energy is calculated using the formula KE = 0.5 * m * v^2.

• Kinetic energy is calculated using the formula KE = m * v.

• Kinetic energy is calculated as the product of mass and velocity.

Give an example of kinetic energy in everyday life.

• A parked bicycle

• A moving car

• A stationary rock

• A frozen lake

What is potential energy and how does it differ from kinetic energy?

• Potential energy is the energy of heat; kinetic energy is energy from chemical reactions.

• Potential energy is only found in moving objects; kinetic energy is static.

• Potential energy is the energy of motion; kinetic energy is stored energy.

• Potential energy is energy stored due to position; kinetic energy is energy of motion.

Describe a situation where potential energy is converted to kinetic energy.

• A car accelerating on a flat road.

• A roller coaster descending from a hill.

• A ball resting at the top of a hill.

• A person standing still on the ground.

What are the main sources of energy used in the world today?

• Solar panels only

• Fossil fuels, renewable energy, and nuclear energy.

• Geothermal energy alone

• Wind energy exclusively

Explain the difference between renewable and non-renewable energy sources.

• Renewable energy sources are always more expensive than non-renewable sources.

• Non-renewable energy sources can be replenished naturally over time.

• Renewable energy sources can be replenished naturally, while non-renewable energy sources are finite and will eventually run out.

• Renewable energy sources are derived only from fossil fuels.

What is the law of conservation of energy?

• Energy can be freely generated from nothing.

• Energy cannot be created or destroyed, only transformed.

• Energy can be created and destroyed.

• Energy is only lost in transformations.

How does gravitational potential energy work?

• Gravitational potential energy is only relevant for objects in space.

• Gravitational potential energy is the energy stored in an object due to its height in a gravitational field.

• Gravitational potential energy decreases as an object moves closer to the ground.

• Gravitational potential energy is the energy of motion in a gravitational field.

What role does energy play in physical systems?

• Energy is only important in chemical reactions.

• Energy is the capacity to do work and influences motion and interactions in physical systems.

• Energy has no effect on physical systems.

• Energy is solely a measure of temperature.

Identify one advantage and one disadvantage of fossil fuels as an energy source.

• Fossil fuels are renewable and have low emissions.

• Fossil fuels are easy to store and have no impact on health.

• Fossil fuels are inexpensive and promote biodiversity.

• Fossil fuels provide high energy density and have an established infrastructure, but they also contribute to environmental pollution and climate change.