Chapter 9 Chapter 9 Tuesday, March 31, 2020 11:01 AM Lecture Notes Page 1
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Chapter 9
Chapter 9Tuesday, March 31, 2020 11:01 AM
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Chapter 9 - Work and Kinetic Energy
Chapter 9 - Work and Kinetic EnergyTuesday, March 31, 2020 11:03 AM
Example Problems Page 21
Example Problems Page 22
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Example Problems Page 24
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Example Problems Page 26
ch09_work_kinetic_energy
Clicker QuestionsTuesday, March 31, 2020 11:06 AM
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Chapter 9: Work and Kinetic EnergyScalar Product DefinitionTuesday, March 17, 2020 10:38 AM
Scalar Product 1 Page 34
Scalar Product 1 Page 35
Scalar Product 1 Page 36
Tuesday, March 17, 202011:51 AM
Problem 9.15Evaluate the dot product of the three pairs of vectors in the figure below.
Scalar Product 2Tuesday, March 17, 2020 11:39 AM
Scalar Product 2 Page 37
Problem 9.11Evaluate the dot product
Scalar Product 2 Page 38
Definitions we care about:
Energy: that property of an object or system that enables it to do work
Work: to exert a force over a displacement
System: a defined collection of objects to be studied
Environment: everything that is not part of the system
Internal Forces: forces that objects within the system exert on other objects within the system
External Forces: forces that the environment exert on the system
Energy OverviewMonday, March 30, 2020 10:41 AM
Energy Overview Page 39
Energy Overview Page 40
Forms of energy we will be dealing with:
Kinetic Energy (K or KE): energy of motion
Gravitational Potential Energy (Ug): energy an object has in an elevated position
Elastic or Spring Potential Energy: energy stored in a stretched or compressed spring
Thermal Energy (Eth): heat - sum of kinetic and potential energies of all the atoms and molecules in an object or system
Chemical Energy (Echem): energy stored in the bonds between atoms and molecules
Types of EnergyMonday, March 30, 2020 10:44 AM
Types of Energy Page 41
Work Done by Gravity
Wednesday, April 1, 2020 10:30 PM
Intro to spring Page 42
Intro to spring Page 43
Intro to spring Page 44
April 7 Tuesday, April 7, 2020 10:58 AM
April 7 Page 45
April 7 Page 46
Tuesday, April 7, 2020 11:36 AM
Preview of what's left Page 47
Tuesday, April 7, 2020 11:46 AM
Thermal Energy Page 48
Thermal Energy Page 49
Tuesday, April 7, 2020 12:00 PM
Power Page 50
Chapter 9 REcapTuesday, April 7, 2020 4:19 PM
Ch. 9 REcap Page 51
Example Problems 9.10, 9.33 (2 ways), and 9.28
Problem 9.10
The cable of a crane is lifting a 750 kg girder. The girder increases its speed from 0.25 m/s to 0.75 m/s in a distance of 3.5 m. (a) How much work is done by gravity? (b) How much work is done by tension?
Problem 9.33
A baggage handler throws a 15 kg suitcase along the floor of an airplane luggage compartment with a speed of 1.2 m/s. The suitcase slides 2.0 m before stopping. Use work and energy to find the suitcase’s coefficient of kinetic friction on the floor.
Ch. 9 REcap Page 52
Problem 9.28
A 60 kg student is standing atop a spring in an elevator as it accelerates upwards at 3.0 m/s2. The spring constant is 2500 N/m. By how much is the spring compressed?
Ch. 9 REcap Page 53
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