Thermal Energy
Which way does thermal energy naturally move: from hot objects to cold objects, or from cold objects to hot objects?
Hot to cold objects
What form of energy is carried by electric current?
Electrical energy
What type of energy does a moving object have?
Kinetic Energy
What is the chemical symbol for carbon dioxide?
CO2
What do we call energy that is not useful for the intended purpose?
Wasted Energy
Name the three methods of heat transfer.
Conduction, convection, and radiation.
What form of energy allows us to see objects?
Light energy
What type of energy is stored in a stretched rubber band?
Elastic potential energy
Which planet is known as the Red Planet?
Mars
What form of energy is most commonly wasted by machines and appliances?
Thermal Energy
What happens to particles when an object is heated?
They move faster
What form of energy is produced by vibrating objects?
Sound Energy
At the highest point of a swing, which type of energy is greatest?
Gravitational potential energy
What is the largest organ in the human body?
Skin
What adjective do we call a machine that converts most input energy into useful output energy?
Efficient
Why does a metal spoon become hot when left in hot soup?
Thermal energy is transferred through conduction.
(Only conduction doesn't count)
A light bulb converts electrical energy into what two forms of energy?
Light energy and thermal energy
At the lowest point of a swing, which type of energy is greatest?
Kinetic energy
What does PPE stand for?
Personal protective equipment
A machine receives 100 J of energy and produces 80 J of useful energy. What is its efficiency? (A percentage)
80%
Explain why hot air rises above cooler air.
1. Particles move faster
2. Particles spread out
3. This makes the air less dense than cooler air
All 3 to get points.
Which form of energy travels fastest: sound energy or light energy?
Light energy
Which factor affects gravitational potential energy more: mass, height, or both?
Both
What particle has a negative charge?
Electron
Energy cannot be created or destroyed. What law states this?
Law of Conservation of Energy