{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lec01_drobny_11

# Lec01_drobny_11 - Lecture 1 Energy 30 Sept Reading Zumdahl...

This preview shows pages 1–8. Sign up to view the full content.

1 Lecture 1: Energy 30 Sept. Reading: Zumdahl 9.1 Outline – Energy: Kinetic and Potential System vs. Surroundings Heat, Work, and Internal Energy Recommended Problems: Z9.10, Z9.15, Z9.18, Z9.20, Z9.21 Working these problems are the key to knowing the material and testing whether you understand the ideas.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Energy: Kinetic vs. Potential Potential Energy (PE) – the energy an object has by virtue of its placement in a field of force, like gravity. PE = mgh in this example, where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) – the energy an object has by virtue of its motion KE = ½ mv 2 , where m = mass, v = velocity
3 Energy Accounting: Potential vs. Kinetic Potential Energy (PE) – the energy an object has by virtue of its placement in a field of force, like gravity. PE = mgh , where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) – the energy an object has by virtue of its motion KE = ½ mu 2 , where m = mass, u = velocity Kinetic E and Potential E are readily interconverted. Total E = KE + PE = mgh 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
4 Energy Accounting: Potential vs. Kinetic Potential Energy (PE) – the energy an object has by virtue of its placement in a field of force, like gravity. PE = mgh , where m = mass, g = acceleration due to gravity, h = height Kinetic Energy (KE) – the energy an object has by virtue of its motion KE = ½ mu 2 , where m = mass, u = velocity Kinetic E and Potential E are readily interconverted. Total E = KE + PE = mgh 1
5 Energy = KE + PE Total Energy is the sum of kinetic energy and potential energy. Energy is readily converted between these two forms. If the system of interest is isolated (no energy exchange with surroundings), then total energy of the system is constant.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
6 Interconversion of KE and PE x = 0 Initial PE = ½ kx 2 where x = displacement, and k is related to spring “stiffness” At x = 0: PE = 0 KE = ½ kx 2 = ½ mv 2 Red – KE Green – PE Blue – Total E
7 Problem: Z9.15 Ball A (2.0kg) swings down (falls) a height of 10. m, and hits B (4.0kg), transfers all energy to ball B which climbs a 3.0 m hill.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 22

Lec01_drobny_11 - Lecture 1 Energy 30 Sept Reading Zumdahl...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online