Types of Energy Gravitational Potentialmgh Kinetic½mV 2 Spring Potential½kx 2 Rotational½I ω 2 Friction?? system.

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Presentation transcript:

Types of Energy Gravitational Potentialmgh Kinetic½mV 2 Spring Potential½kx 2 Rotational½I ω 2 Friction?? system

Internal Energy, U the energy associated with the microscopic components of the system It includes kinetic and potential energy of translational, rotational and vibrational motion of the atoms or molecules

Friction Internal Energy, U Temperature, T

Joules Calorie A historical unit A Calorie (food calorie) is 1000 cal 1 cal = Joules Internal Energy, U Temperature, T 1K = 1°Celsius Fahrenheit Reaumur 0°Celsius 100°Celsius 0 K = °C

Heat is a mechanism by which internal energy is transferred form one object to another because of a temperature difference between them.

U ~ T Other variables? ΔU ~ ΔT 1.Amount of material (mass or volume) 2.Material property to change temperature ΔU ~ m ΔU ~ mΔT ΔU = C mΔT SPECIFIC HEAT or SPECIFIC HEAT CAPACITY

Units J / kg °C cal / g °C is the amount of energy required to change the temperature of unit mass by 1° Celsius. Specific Heat

Cup A contains 100 grams of water and cup B contains twice as much water. The water in both cups was initially at room temperature 25°C. Cup A was heated to 75°C and cup B was heated to 50°C. Which cup had more heat energy transferred to it? Cup A Cup B The same ΔU = C mΔT

Cup A contains 100 grams of water at 0°C and cup B contains 100 grams of water at 50°C. The contents of the two cups are mixed together in an insulated container (no heat can transfer in or out). What is the final temperature of the water in the container? A) Lower than 0°C B) 0°C C) between 0°C and 25°C D) 25°C E) Between 25°C and 50°C F) 50°C G) Higher than 50°C

Cup A contains 100 grams of water at 0°C and cup B contains 200 grams of water at 50°C. The contents of the two cups are mixed together in an insulated container (no heat can transfer in or out). What is the final temperature of the water in the container? A) Lower than 0°C B) 0°C C) between 0°C and 25°C D) 25°C E) Between 25°C and 50°C F) 50°C G) Higher than 50°C

Table, specific heat

Heat is a mechanism by which internal energy is transferred form one object to another because of a temperature difference between them.

The water in a cup is initially at 55°C, and the cup is in a room where the temperature is 25 °C. A

HW. Chapter 11.1, 11.2, 11.3 Quizzes and Examples!!! Problems 2, 10, 16, 24

Number of students Test scores Distribution