Show:
Nature of Energy
kinetic and Potential Energy
Energy Conversions
Conservation of Energy
Physics and Energy
Calculations
100
The ability to do work
What is Energy
100
The five forms of energy can be classified into either one of these states of energy
What is kinetic energy and potential energy
100
This is the most common type of energy conversion
What is potential energy to kinetic energy or vice versa
100
The law of conservation of energy states that energy can be neither
What is created or destroyed by ordinary means
100

What is energy? 

The ability to do work or cause change.

100

An 25kg object is sitting on the top of a 30m cliff on mars which has a gravity of .5. What is the object's total potential energy? 

Gpe=mgh = 25*30*.5 = 375J

200
What are the five main forms of energy?
What is mechanical, heat, chemical, electromagnetic, and nuclear energy
200
The energy of motion is called
What is kinetic energy
200
Changes in the form of energy are referred to as
What is energy conversions
200
Energy from the sun is created through a process called
What is nuclear fusion
200
how is energy related to power
What is power is the rate at which energy is consumed
200

An 10 kg object is moving down a hill. At the bottom of the hill it has a velocity of 5m/s. What is the object's total kinetic energy? 

ke=1/2*m*V*V = 5*5*5=125J

300
The center of an atom is the source of this type of energy
What is nuclear energy
300
energy of position is
What is potential energy
300
When a ball is bounced it expresses both potential and kinetic energy. At what point does the ball have its greatest amount of potential energy
What is at the ball's maximum height and zero velocity
300
According to the theory of relativity, if mass is lost this is created
What is energy
300
How is momentum related to energy
What is they are both measured using mass and velocity. An object that has momentum has kinetic energy.
300

A 100kg person dives from an airplane traveling 3*10^3m above the ground. After 5 seconds, he is traveling at a velocity of 49 m/s. Calculate his mechanical energy in terms of both kinetic and potential. Ignore friction 

Total energy: 2.94*10^6j=mgh

2.94*10^6-1.2*10^5=2.82*10^6j of GPE remaining

Ke =1.2*10^5 j

400
what type of energy is carried by X-rays
What is electromagnetic energy
400
A rubberband stretched between two anchor points has this type of energy
What is potential energy
400
plants have the ability to store the sun's energy as this type of energy
What is chemical energy
400
When you turn on light bulb electricity flowing through the filament is converted into what energy form/forms
What is electromagnetic energy-light, and heat
400
The only energy that does not come directly out of a machine is that taken by
What is friction
400

A person is bobsledding down a hill. At the bottom of the hill, the sled moves with a velocity of 50m/s. If the man and sled had a combined mass of 250kg, how tall was the hill? 

KE = 250*.5*50^2 = 312500 j


GPE = 250 * 9.8 * h = 312500 

h=127.5m

500
The wind blowing outside has this type of energy
What is mechanical energy
500
Between a doubling in an objects mass or a doubling of an objects velocity, which has a greater effect on the object's kinetic energy
What is a doubling of an objects velocity
500
these three types of energy are all involved in a running automobile engine
What is chemical energy, heat energy, and mechanical energy
500
This man is known for saying that mass and energy can be converted into each other
What is Albert Einstein
500
How many physical phenomena have been observed to violate the law of conservation of energy during the time of humans
What is none
500
If a 70kg man falls from a building that is 100m tall, how much velocity does he have the second he hits the ground? 

GPE = 70*9.8*100 = 68600 j

68600 = .5*70*V^2

V*V = 1960j

V=44.3m/s