Download forms-of-energy-worksheet

Name
Forms of Energy
Date
Class
How Can You Find an Object’s Mechanical Energy?
1a. Mechanical energy is the form of energy associated with the
, ______
, or
of an object.
b. At a certain point the kinetic energy of a falling apple is5.2 J and its potential energy is 3.5 J. What is its
mechanical energy?
c. If an object’s mechanical energy is equal to its potential energy, how much kinetic energy does the object have?
Explain.
2a. EXPLAIN Why do the particles of objects have both kinetic and potential energy?
b. CLASSIFY The energy you get from eating a jelly sandwich is in the form of
______ energy.
3. On the back of this paper, list five forms of energy associated with the particles
of an object. Identify each form as a type of potential energy, kinetic energy, or both
(depending on whether it is moving or stored).
4. How can you determine an object’s mechanical energy? ________________________________
5. Mechanical energy is associated with the motion, position, or
of an object.
6. Electromagnetic energy travels through space in the form of
.
7. Lightning is a form of
energy.
8. The breaking of
9. The
bonds in food releases energy for your body to use.
the temperature of an object, the lower its thermal energy.
10. Electrical energy is the energy of
.
Building Vocabulary Match each illustration with the correct form(s) of energy
a. mechanical energy
b. nuclear energy
d. electrical energy
e. chemical energy
3.
c. thermal energy
f.
4.____
6.
electromagnetic energy
__ 5.
7.
8.
The Cost of Electrical Energy
Read the passage below & fill in the table, using $0.10 per kWh to calculate the cost of running each appliance for 1 day.
The watt (W) is a unit of power & that a kilowatt (kW) is 1,000 watts. The unit used by electric companies to measure the
energy you use in your home is called the kilowatt-hour (kWh). One kilowatt-hour is 1,000 watts of energy used for 1 hour.
To calculate the cost of operating an appliance, you must first determine the energy used in kilowatt-hours. To do this,
multiply the power rating (watts) of the appliance by the number of hours you use the appliance, then divide that number
by 1,000. For example, a 100-watt light bulb used for 5 hours a day would use 0.5 kWh per day
 100 W  5 h

= 0.5 kWh 

.
 1,000

If you are paying $0.10 per kWh, then the cost of using that light bulb for 1 day would be 0.5 kWh × $0.10, or $0.05.
Appliance
Microwave oven
Electric stove/oven
Clothes dryer
Estimated Time
Used (h)
9.
10.
Cost ($)
1,500
12,000
5,000
Vacuum cleaner
Dishwasher
Cost ($)
600
1,300
What are three things that people in the family could do to reduce their electric bill.
To find an object’s mechanical
energy, you add its
A kinetic and potential energy
B kinetic and thermal energy
C potential and thermal energy
D kinetic and chemical energy
11.
Nuclear fusion reactions occur in
A
B
C
D
nuclear power plants
a microwave oven
a match that is struck
the sun
12.
A form of energy NOT associated with
the particles of objects is
A thermal energy
B mechanical energy
C nuclear energy
D chemical energy
13.
The total potential and kinetic energy
of the particles of an object is the object’s
A nuclear energy
B electromagnetic energy
C thermal energy
D mechanical energy