Physics Energy Part 3

What type of energy does a swing have at the highest point of its arc?

• Kinetic energy

• Potential energy

• Thermal energy

• Electrical energy

Which of the following best describes a closed system in terms of energy?

• A system where energy is created

• A system where energy is destroyed

• A system where energy is neither created nor destroyed, only transformed

• A system where energy is constantly lost to the surroundings

How is potential energy converted to kinetic energy in a roller coaster?

• When the roller coaster is at the top of a hill and starts moving down

• When the roller coaster is at the bottom of a hill and stops

• When the roller coaster is moving up a hill

• When the roller coaster is stationary at the top of a hill

If a swing has 50 J of potential energy at its highest point, how much kinetic energy does it have at the lowest point, assuming no energy is lost?

• 0 J

• 25 J

• 50 J

• 100 J

Which of the following scenarios best illustrates the conservation of mechanical energy?

• A car engine converting chemical energy to mechanical energy

• A windmill converting wind energy to electrical energy

• A swing moving back and forth with constant total energy

• A solar cell converting sunlight to electrical energy

What happens to the kinetic energy of a roller coaster car as it climbs a hill?

• It increases

• It decreases

• It remains constant

• It is destroyed

Calculate the total mechanical energy of a system if it has 30 J of potential energy and 20 J of kinetic energy.

• 10 J

• 20 J

• 30 J

• 50 J

Which of the following is an example of potential energy being converted to kinetic energy in everyday life?

• A battery powering a flashlight

• A person eating food

• A ball rolling down a hill

• A car parked on a hill