Definitions
What is the energy of motion called?
Kinetic energy
What is the form of energy we observe as heat?
Thermal energy
What form of energy includes thunder and radios?
Sound
What is another way to phrase "inputs and outputs"?
Hint: starts with a C and E
cause and effect
Calculate the work done by a 9N force moving an object 8 meters.
W=Fd
9*8 = 72
What is the energy stored due to an object's position, composition, or condition called?
Potential Energy
What is the combination of potential and kinetic energy?
Mechanical energy
What form of energy is x-rays and microwaves
Electromagnetic energy
List two outputs of energy from the system of a car
electromagnetic, thermal, sound
An 8 kg object travels 10 miles at a rate of 5 m/s. How much kinetic energy did it have?
KE = 1/2 mv2
KE = 1/2 * 8 * 52
KE = 100 J
What is the ability to do work or to cause changes in matter called?
Energy
What type of energy is light?
Electromagnetic
What form of potential energy does a rock sitting on the edge of a cliff have?
Gravitational potential energy
What is the input energy for a child running around?
chemical energy
A 6 kg bird was sitting on a tree branch 20 ft above the ground. What was its potential energy?
GPE = mgh, g=10
GPE = 6*10*20
= 1,200 J
What is a group of interacting parts that move or work together called?
A system
Name two forms of potential energy
elastic, chemical, nuclear, gravitational
What form of energy is a stretched rubber band
Elastic energy
What are the inputs and outputs of a rock climber
Input: chemical energy
Output: gravitational potential energy
Which one has more Kinetic Energy?
Object 1 is 10 kg going 4 m/s
Object 2 is 4 kg going 10 m/s
KE = 1/2 mv2
Object 1: 1/2 * 10* 42 = 80 J
Object 2: 1/2 * 4 * 102 = 200 J
Object 2 has more kinetic energy
What is it called when energy changes from kinetic to potential?
Energy transformation
Name 3 forms of kinetic energy
thermal, electromagnetic, sound, electrical
What type of energy includes batteries and matches?
Chemical energy
What are the inputs and outputs on evaporating water
Input: electromagnetic
Output: thermal
A 3 kg ball was thrown into the air. The ball reached a maximum height of 11 ft. What was its potential energy when it landed on the ground?
GPE = mgh, g=10
When the ball is on the ground, it has a height of 0
PE = 3*10*0
PE = 0 J