Physics

Thermal Energy

 

1.  True or False:  Heat flow is a form of Energy Transfer.

 

2.  What is the unit for Energy (an old friend)

a)  Watts        b)  Newtons     c)  Joules     d)  Kg

 

3.  According to the kinetic-molecular theory, which has more energy

a)  a hot body      b)  a cold body

 

4. True or False:  Temperature depends only on the average kinetic energy of an object, not on the number of particles (mass)

 

5.  True or False: Thermal energy, unlike temperature, does depend upon the number of particles (mass) of an object

 

6.  Which do you think has a higher temperature:

a.  The Ocean     b.  A large cup of hot coffee

 

7.  Which do you think has a larger amount of thermal energy

a.  The Ocean     b.  A large cup of hot coffee

 

8.  To establish thermal equilibrium

a.  Thermal energy is transferred from a cold object to a hot object

b.  Thermal energy is transferred from a hot object to a cold object

 

9.  When you place an ice cube in a glass of water, why does the ice cube melt?

a.  The ice gives all of its cold to the warmer water and lowers the temp of the water.

b.  The warmer water transfers its heat to the ice cube and melts the ice

 

10.  What is heat:

a.  The energy that flows between two objects as a result of temperature differences

b.  Heat is the exact same thing as temperature

 

11.  The letter “Q” is used to describe heat.  When Q is negative

a.  Heat has left the object (exothermic)

b.  Heat has been absorbed by the object (endothermic)

 

12.  Write a brief sentence about how each of these methods of heat transfer work.  Also, give an example in real life where you’d find each one.

-Conduction:

 

-Convection:

 

-Radiation:

- Equilibrium

- Exothermic

 

-Endothermic

 

 

13.  What is Specific Heat:

a.  The specific amount of heat inherent in an object

b.  The amount of energy that must be added to the material to raise the temperature of one gram of it by one degree.

 

14.  What one substance on Earth has a very high specific heat

a.  Iron     b.  Water     c.  Copper     d.  Aluminum

 

18. True or False:  As ice melts, its temperature remains the same (look at the graph)

 

19. True or False:  As water heats up, its temperature remains the same (look at the graph

 

20.  True or False:  The first law of thermodynamics is essentially a restatement of the law of conservation of energy.

 

21.  What is the law of conservation of energy?

 

22.  What is the name of a device that can convert thermal energy (heat) into mechanical energy (work)?

 

23.  Name one heat engine that you see everyday. (you might ride in it to school)

 

24.  Is all of the thermal energy that is used in firing a piston in your car used to do useful work?  If not, where does it go?

 

25.  What is entropy?

a.  Heat     b.  A measure of disorder of a system    c.  Temperature

 

26.  True or False:  The second law of thermodynamics states that all things will become more disordered unless some action is taken to keep them ordered.