Mechanical Energy
True or False
Kinetic energy is the amount of potential energy an object has when it is at a point and can fall due to gravity.
False. This is gravitational potential energy.
List all four forms of non-mechanical energy described today.
Chemical
Sound
Thermal
Light
What forms of energy can be seen in a fire?
Thermal, and light
True or False.
The amount of energy in the universe will remain the same and is conserved.
True
What has more kinetic energy?
A stationary bowling ball or a baseball being thrown by a pitcher?
The baseball
Do unstable substances have more or less chemical potential energy?
More.
What can we conclude about citrus juice based on its reaction with fire?
It is unstable and has a lot of chemical potential energy
True or False.
When a ball is sitting on top of a building it has no energy, but when it falls it creates kinetic energy.
False.
The amount of energy in the ball remains the same, the energy is just changed into kinetic energy.
What kind of energy can a spring have, that a wooden log does not?
Elastic Potential energy.
What types of non-mechanical energy does fire produce?
Thermal, light, and sound.
How does the combination of vinegar and baking soda demonstrate chemical energy?
The vinegar and baking soda are unstable reagents which react to form a more stable compound. This releases energy.
When energy is "lost", what type of energy is it usually dissipated as?
Thermal energy.
Think About it.
If two identical balls are dropped from a building and it takes Ball A 2 seconds to hit the ground, and Ball B 10 seconds to hit the ground, which has more gravitational potential energy and why?
Ball B. If it took longer for it to fall then it was higher up than ball A, meaning it has more gravitational potential energy.
Do 10 grams of skittles have more or less chemical potential energy than 10 grams of wheat bread?
If we were to light both of them fire which would burn more?
10 grams of skittles.
Skittles
When the two weights were hit together, what types of energy are shown?
How does this demonstrate the conservation of energy?
Kinetic, sound, thermal
It demonstrates how energy is always conserved, as the kinetic energy is made into sound and thermal energy.
In the PhET simulation the skateboarder would have the same amount of gravitational potential energy, and kinetic energy forever. In reality, would this occur?
No. In reality, there is always friction which causes this mechanical energy to be converted to heat or sound.
What has more energy a moving train, or a bullet that has been shot out of a gun?
A moving train.
What is light energy described as?
Electromagnetic radiation.
What does the Eulers disk show about gravitational potential energy, kinetic energy, sound energy, and conservation of energy?
The gravitational potential energy of the starting disc goes to increase its rotational kinetic energy. This is then all converted to sound energy, which is why the disc stops.
As the seasons progress the amount of sunlight (a form of light energy) New Jersey gets changes. Based on what you know about the conservation of energy describe how the amount of sunlight we receive causes the seasons to change temperatures.
The sunlight is conserved in the form of thermal energy when it reaches the earth's surface, so the less sunlight we receive would cause a decrease in the temperature.