Colin's PHYSICS 4 KIDS!

WORK, POWER, AND ENERGY!

Here's what you'll need to know to HELP PERRY!

Gravitational Potential Energy (GPE) is when energy is there but is not being used yet. ex: A man standing on a diving board.

Kinetic Energy (KE) is when some of the GPE is being used. ex: A man skydiving, halfway down has not used 50% KE.

Elastic Potential Energy (EPE) is when energy is compressed ready to release. ex: A spring ready to push a car has 100% EPE.

Dissipated energy (DE) Energy is always lost whenever it transfers, dissipated energy is that small bit of energy lost during a transfer. ex: A car reaches 0-60 mph, about 10% of the total energy used to get the car to 60 mph has not been lost, never to be recovered.

Everything we do revolves around work, power, and energy. 

Work is measured in joules, a joule is a unit of energy, and can be determined through newtons x meters.

Power is measured is watts, which is also a unit of energy, and can be determined through Joules divided by seconds.

The Two Laws of Thermodynamics  - The first law of thermodynamics, also called conservation of energy, states that  the total amount of energy in the universe is constant. This means that all of the energy has to end up somewhere, either in the original form or in a different form.
-The second law of thermodynamics states that the disorder in the universe always increases. After cleaning your house, it always has a tendency to become messy again. This is a result of the second law. As the disorder in the universe increases, the energy is transformed into less usable forms. Thus, the efficiency of any process will always be less than 100%.

Perry needs to find out the gravitational potential energy (GPE) while he is atop a slide so he can slide down to Dr. Doofenshmirtz who is sitting on a giant sprint waiting to be launched into the moon! What is the energy of the Perry and Dr. Doofenshmirtz? Answer: C

a. Perry = 100% EPE, Dr. Doofenshmirtz - 100% GPE

b. Perry = 50% GPE, Dr. Doofenshmirtz = 50% EPE

c. Perry = 100% GPE, Dr. Doofenshmirtz = 100% Elastic Potential Energy

Perry is now halfway down the slide, he can see Dr. Doofenshmirtz getting ready to launch himself! To stop Dr. Doofenshmirtz Perry needs to have at least 80% kinetic energy to have enough force to tackle the Dr. off the giant spring! Halfway down the slide what is Perry's total energy? ALSO, once Perry reaches the bottom will be have enough kinetic energy to stop Dr. Doofenshmirtz? Or will he take over the moon?!?! Answer: C and Yes!

a. Perry = 100% KE.

b. Perry = 25% GPE, 25% KE

c. Perry = 50% GPE, 50% KE. 

Yes/No

Perry tackles Dr. Doofenshmirtz just in time before the spring launched him! All the energy in Perry now transfered to Dr. Doofenshmirtz, enough to through him 20 feet away! Is this a result of the first or second law of thermodynamics? answer: A

a. First Law

b. Second Law

After Perry tackles Dr. Doofenshmirtz to the ground, he lifts him up 4 meters over 10 seconds. Perry uses 200 newtons of force to put Dr. Doofenshmirtz into a police car to take him to jail!  How much power is Perry using? Answer: A

a. 80 watts of power

b. 40 watts of power

c. 800 watts of power

 Perry is super thankful for all your help in taking down the evil Dr. Doofenshmirtz, here is a fun game to go play and practice your sidekick skills! Click on the link below!