Physics Live Lesson Energy Exchange Unit Test Concepts

Energy is the ability to do work application of a force movement due to

Initial Total Energy = Final Total Energy *In a closed system (no loss due

Total Energy = Potential Energy + Kinetic Energy TE = PE + KE given:

Potential Energy (PE) PE = Stored energy due to height PE = mgh (Note:

Electric Potential Energy: PEE = charge * voltage PEE = q. V Spring Potential

In a closed system, the initial kinetic energy is 70 J. The initial potential

The total initial energy of a closed system is 1020 J. During an experiment,

What is the initial electric potential energy of an electron leaving a 200 -volt

A moving object is rolling on a surface that is 5 m off the

A computational model predicts the maximum kinetic energy a roller coaster can have given

What would our formula look like to solve this question? What will we include

• The value of G increases significantly the closer the planet is to

Essay Question: A pendulum is a body that is suspended from a fixed point

Questions? Feel free to contact me for help: Webmail, Phone, Text 775 -403 -2315

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Physics Live. Lesson Energy Exchange Unit Test • Concepts • Skills

Part I: Concepts

Energy is the ability to do work application of a force movement due to force Law of conservation of energy: Energy cannot be created or destroyed. It can transform from one form to another, but the total amount stays the same.

Initial Total Energy = Final Total Energy *In a closed system (no loss due to friction, etc. )

Part II: Applying what we learned

Formulas:

Total Energy = Potential Energy + Kinetic Energy TE = PE + KE given: PE = mgh KE = ½ mv 2 we get: TE = mgh+ ½ mv 2

Potential Energy (PE) PE = Stored energy due to height PE = mgh (Note: gravitational PE) Kinetic Energy (KE) KE = Energy of motion KE = ½ mv 2

Electric Potential Energy: PEE = charge * voltage PEE = q. V Spring Potential Energy: PEs = ½ kΔ x 2 Thermal energy: Q = mc Δ T

Review Questions

In a closed system, the initial kinetic energy is 70 J. The initial potential energy is 20 J. What is the total final energy of the system?

The total initial energy of a closed system is 1020 J. During an experiment, 500 J of this energy is converted into kinetic energy. What is the total final energy of this closed system?

What is the initial electric potential energy of an electron leaving a 200 -volt battery if the charge of an electron is 1. 602× 10− 19 coulombs?

A moving object is rolling on a surface that is 5 m off the ground. The object is moving at a constant speed of 4 m/s. If the object is 3. 2 kg, what is the final energy of the ball after rolling for 10 m, assuming friction is negligible?

A computational model predicts the maximum kinetic energy a roller coaster can have given its mass, the speed at the highest point of its journey, and the height of the highest point. The mass is 250 kg, and the highest point of the journey is at 30 m, where the cart is at rest. What is its maximum kinetic energy?

What would our formula look like to solve this question? What will we include or leave out?

• The value of G increases significantly the closer the planet is to the sun. • The value of KE total increases because U has a lesser negative value. • The value of E total increases significantly the closer the planet is to the sun. • The value of KE total increases because U has a larger negative value.

Essay Question: A pendulum is a body that is suspended from a fixed point so that it can swing back and forth through an exchange of kinetic energy and gravitational potential energy. Using 1– 2 sentences, explain what happens to the kinetic energy and gravitational potential energy of the pendulum at the highest point and at the lowest point of its swing. ?

#15 is dropped from this test

Questions? Feel free to contact me for help: Webmail, Phone, Text 775 -403 -2315