Elementary Science Department
Semester 2
Grade4
H.W. Sheet (9.1)
Name: ………………………………………………….……..
Date: ………………………….
1) Choose the correct answer then fill in the corresponding bubble:
Ellie plugs a radio into an electrical outlet and turns it on. What change in energy takes
place when she does this?
Light energy changes into sound energy.
Electrical energy changes into sound energy.
Sound energy changes into electrical energy.
Chemical energy changes into sound energy.
Fossil fuels are the most common source of energy. What else is true of fossil fuels?
They are renewable.
They form quickly underground.
They can be made in a laboratory.
They are burned to release energy.
1
A rolling ball has kinetic energy. What does it mean for an object to have kinetic energy?
The object is in motion.
The object has stored energy.
The object has used all of its energy.
The object is passing on its energy.
Objects can have potential energy because of their position. Which object has potential
energy?
book sitting on a table
hands turning on a clock
spinning wheels on a bike
flag flapping in the wind
Objects may have potential energy or kinetic energy. How do potential energy and kinetic
energy compare to each other?
Both describe objects at rest.
Both describe objects in motion.
Both are forms of mechanical energy.
An increase in one leads to an increase in the other.
2) Match:
______1-The ability to cause change in matter.
A-
Electrical energy
______2-The energy of motion.
B-
Chemical energy
______3-Energy that an object has because of its
C-
Kinetic energy
D-
Energy
E-
Potential energy
position or its condition.
______4-The total potential and kinetic energy of an
object.
_____5-Energy that can be released by a chemical
reaction.
______6- Energy that comes from electric current.
2
F- Mechanical energy
3) Put (√) or (x) :
1- In the T.V electrical energy is changed to light and sound energy.(
2- When the pogo stick is squeezed it has kinetic energy stored in it. (
)
)
3- The roller coaster car has mechanical energy which is equal to its kinetic energy only.
(
)
4- Chemical energy changes into light energy in a glow stick.(
)
5- The batteries change electrical energy to chemical energy to move a toy car.(
6- Light energy is produced by vibrating objects. (
7- Light energy can travel through space. (
)
)
)
4) Answer the following question:
1- The picture below shows two objects, Book A and Book B, at rest.
Identify which object has more potential energy. Explain why.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.
3
2- During an experiment, Corrine uses a piece of equipment to send a ball into the air. The
picture below shows Corrine’s equipment. It shows how the ball travels.
What type of energy will the ball have just before it comes down?
And what type of energy the ball will have during its falling down?
Explain your answer.
o Energy before the ball falls is: --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------.
o Energy during the ball fall is: -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
4