Potential energy
What does PE stand for?
Potential Energy
What does KE stand for
Kinetic Eenergy
What is the law of conservation of energy?
Define Thermal energy
The total KE of tiny particles that make up matter.
Faster particles=warmer
What is the definition of Potential energy
Energy that is stored in a system or object.
What is the definition of Kinetic energy
energy of motion
Where does most of Earth's energy come from?
The sun
What are the three types of heat transfer
Conduction, convection, radiation
On a rollercoaster, the cart climbs to the very top, stops, then heads down the hill to the bottom. At what point does it have the highest PE?
The top
On a rollercoaster, the cart climbs to the very top, stops, then heads down the hill to the bottom. At what point does it have the highest KE?
The bottom
What energy transformations happen in this energy chain?
Sun to plant to bunny to bunny running.
Light, chemical, chemical, mechanical
You're making s'mores with some friends. What is happening to the chocolate that causes it to melt?
Conduction from the marshmallow.
What is the equation for PE?
PE= Mass x Gravity x Height
What is the equation for KE?
KE= .5 x Mass x Speed2
Name and explain the energy transformation that occurs in the human body.
Electrical: The nervous system.
Thermal: when you sweat
Mechanical: When you run
Sound: talking
Chemical: When you digest food.
It is a hot, sunny summer day, and you go to the beach. The sun is high in the sky; there is a breeze over the ocean, and the sand you step on is very hot.
From this story, label each part of heat transfer.
Radiation: sun's rays
Convection: the breeze
Conduction: The hot sand.
Mr. Haydu is riding a bike down a hill. At the top of the hill, he is 30m high, not moving, and weighs 165 pounds. He rides down the hill and reaches the bottom at 30 m/s and still weighs 165 pounds. What is his PE in joules?
PE= 165 pounds x 9.8 x 30 m
= 48,510 j
Mr. Haydu is riding a bike down a hill. At the top of the hill, he is 30m high, not moving, and weighs 165 pounds. He rides down the hill and reaches the bottom at 30 m/s and still weighs 165 pounds. What is his KE in joules?
KE= .5 x 165 pounds x 302
=74,250 joules
Name all 7 energy transformations.
Light, nuclear, electrical, thermal, mechanical, sound, chemical.
Explain how the three types of heat transfer work when boiling water?
The radiation from the eye of the stove heats the pot. The water in the pot boils, causing convection to occur. Due to the heat from the radiation, the handle of the pot shows conduction.