Mechanical Mania
Mechanical energy is a combination of all the _________ energy and ________ energy in an object.
Potential and kinetic
Name the word that matches this definition:
A form of energy in the form of charged particles.
Electricity
What is the scientific name described in this definition?
potential energy stored in chemical bonds that hold chemical compounds together.
chemical potential energy
molecules
What two factors determine the amount of kinetic energy an object has?
mass and speed
Give an example of an object having both potential and kinetic energy at the same time.
A leaf falling to the ground but hasn't landed yet.
What is the name of the charged particles that cause electricity?
electrons
A thing that is made up of two or more elements is called a ________________.
Chemical compound or a mixture
In warm objects, molecules move __________ and in cold objects, molecules move ____________.
Faster and slower
What is the definition of mass?
The amount of matter in an object
Look at the clock on our classroom wall. Why is the working clock an example of an object that has potential and kinetic energy at the same time?
The clock is working right now, but it has enough energy to continue working until a later time (when the batteries run out).
Electrons circle around an atom and have a ______________ charge.
negative
Describe how chemical potential energy is transformed into kinetic energy with a match or a candle.
A match or a candle has the chemical potential energy to cause a fire when it is lighted.
The measure of how much thermal energy an object has is called ________.
Heat
Kinetic energy is measured in what type of unit?
joules
Mechanical energy is the total of all the energy in an object. What is the difference between potential and kinetic energy?
Potential energy is stored energy and kinetic energy is energy associated with motion.
Explain why electrons get pulled away from an atom and become free flowing, which causes electricity to occur.
When an atom has too many protons with a positive charge they try to get electrons, which have a negative charge so that they can be balanced.
Describe the transformation from chemical potential energy to kinetic energy that occurs when you eat a meal.
You eat a meal and whatever you eat is broken down and transformed into kinetic energy in your body that you can use a few hours later to do all the things you do, such as breathing, walking, talking, etc.
Heat always transfers from the _________ object to the _________ object.
Choices: hottest and coldest
hottest and coldest
A beach ball and a bowling ball were sitting on a shelf. Someone bumped the shelf and the bowling ball and beach ball rolled off the shelf at the same time. They both hit the ground at the same time and had the same speed. Which one had the greatest amount of kinetic energy just before they hit the ground?
The bowling ball because it has more mass.
Name the word that matches this definition:
The total energy of the motion and position of an object.
Mechanical energy
Describe an example of chemical potential energy being converted into electric energy (hint: it probably happens in the items you have right now).
batteries, which have chemical potential energy convert this energy to electric energy so that you can use your phone or chromebook without an electric cord.
In order for chemical potential energy to be transformed into kinetic energy a ____________
_______________ must occur.
Chemical reaction
Describe these three forms of thermal energy:
conduction
convection
radiation
conduction: transfers between objects (solids)
convections: transfers in fluids (liquids or gasses)
radiation: transfers in electromagnetic waves
Dale Earnhardt Jr.'s race car has a mass of 3kg and a speed of 5 miles per hour.
Debbi Denney's race car has a mass of 3kg and a speed of 10 miles per hour.
Which car has the most kinetic energy?
Debbi Denney's car because it has more speed.