Chapter 5 Energy. Thermal Resistance Overview R thermal – Δ T/Q H Δ T temperature difference T heater – T heat Sink Q H heat flow rate V x IWatts or J/sec.

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Presentation transcript:

Chapter 5 Energy

Thermal Resistance Overview R thermal – Δ T/Q H Δ T temperature difference T heater – T heat Sink Q H heat flow rate V x IWatts or J/sec Conversion 1 calorie = J 1 Watt = cal/sec

Energy in Mechanical Systems Energy - a property that allows an object to do work Measured in Joules Law of Conservation of Energy - energy in a system must remain constant. Therefore, energy can not be created or destroyed

Kinetic Energy - energy of motion Linear KE = ½ mv 2 Rotational KE = ½ mr 2 ω m- mass r- radius ω - angular velocity (rad/sec)

Potential Energy - stored energy Gravitational (positional) PE G = (m) (g) (h) m- mass g- accel. due to gravityh- height o Elastic (compressed or stretched) o PE Elastic = ½ kx 2 k- spring constantx- displacement of spring

5.1 Lab Using Energy in Compressed Air to Operate Air Motors

5.2 Lab Measuring Energy Stored in a Compressed Spring

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