Exploring Energy and Forces

What is renewable energy?

• Energy derived from fossil fuels like coal and oil.

• Energy that cannot be replaced once used, like nuclear energy.

• Renewable energy is energy from sources that are naturally replenished, such as solar, wind, and hydro.

• Energy generated from non-renewable sources such as natural gas.

Name two types of renewable energy sources.

• Solar energy, Wind energy

• Coal energy

• Natural gas

• Nuclear energy

What is the definition of force in physics?

• Force is the weight of an object in a gravitational field.

• Force is an interaction that causes a change in an object's motion.

• Force is the speed of an object in motion.

• Force is the amount of energy in an object.

List three types of forces.

• centrifugal force

• nuclear force

• tension force

• gravitational force, electromagnetic force, frictional force

What is gravitational force?

• Gravitational force is the force that keeps objects in motion.

• Gravitational force is the attraction between two masses.

• Gravitational force is the repulsion between two masses.

• Gravitational force is the energy produced by a mass.

How does gravity affect objects on Earth?

• Gravity pulls objects toward the Earth, giving them weight and causing them to fall.

• Gravity pushes objects away from the Earth, making them lighter.

• Gravity has no effect on objects, allowing them to float freely.

• Gravity only affects large objects, not small ones like pebbles.

What is the difference between contact and non-contact forces?

• Contact forces are always stronger than non-contact forces.

• Contact forces involve direct interaction; non-contact forces operate at a distance.

• Contact forces can only occur in liquids and gases.

• Non-contact forces require physical touch to act.

Give an example of a non-contact force.

• Frictional force

• Gravitational force

• Magnetic force

• Tension force

What role does renewable energy play in reducing carbon emissions?

• Renewable energy increases carbon emissions by promoting industrial growth.

• Renewable energy reduces carbon emissions by providing clean electricity that replaces fossil fuels.

• Renewable energy has no impact on carbon emissions and is purely for economic gain.

• Renewable energy only benefits urban areas and does not affect carbon emissions globally.

How does gravitational force vary with distance?

• Gravitational force remains constant regardless of distance.

• Gravitational force decreases with the square of the distance.

• Gravitational force increases with distance.

• Gravitational force varies linearly with distance.