Types of Energy
What is Energy?
The ability to do work
What is the definition of potential energy?
Energy stored in a body or system due to its position relative to the Earth.
What is the law of conservation of Energy?
This states that energy can change from one form to another, but it cannot be created or destroyed.
-When energy is "used" it does not disappear...it simply changes to another form.
What is the formula and unit for speed?
Meters per Second
S=D/T
What is the formula and unit for Work?
Joules
W=FxD
What is the formula and unit of Power?
Watt
P=W/T
What type of energy is stored OR in motion?
Mechanical Energy
What is the definition of Kinetic Energy?
Energy in motion.
What kind of energy transformation happens when you burn coal?
What is the formula and unit for distance?
Meters
D=SxT
What is the formula and unit for Force?
Newtons
F=W/D
Thermal energy (heat energy) is responsible for the temperature of a system. Radiant energy (light or solar) is responsible for things connected to electromagnetic radiation (like light and x-rays).
At what two points on a swing are the potential and kinetic energy the highest?
Highest Kinetic = midpoint between the forward and backward points
What kind of energy transformation occurs when a firefly glows?
Chemical Energy to Radiant (light) energy
What is the formula and unit for time?
seconds
T=D/S
Contrast Nuclear Energy and Chemical Energy
Calculate the Potential Energy of a 90kg man standing on top of a 200m building. Include your units!
176,400 Joules
What kind of energy transformation occurs when a person is playing a violin?
Mechanical energy to Sound energy
You challenge your younger sibling to eat as many cookies as they can in 120 seconds with the starting distance from their hand to their mouth being 1.5 meters. What is their cookie eating speed?
S = 1.5 meters/ 120 seconds
S=0.0125 cookies eaten per second
What is electrical energy and describe two sources of it.
Electrical energy is concerned with the moving of electrons.
-electric current in an electrical circuit
-wind, batteries, outlets, water, etc.
At the top of the first hill of a roller coaster, the passengers are 300m up in the air. The average mass of the car they are in is 1,250kg. On the way down the hill, the rides reaches a velocity of 75m/sec.
What is the Ride's Potential & Kinetic Energy? Include your Units!
Potential = 3,675,000 Joules
Kinetic = 3,515,625 Joules
What energy transformations occur when you turn on a light bulb?
Electrical energy to Radiant (light) energy and Thermal (heat) energy
You are driving in your brand new car. How fast are you going down the highway if you have traveled for 400 seconds, the car is producing 20N of Force, and is doing 30J of work?
S = 0.00375m/sec