USEFUL SCIENCE INFORMATION-

As we are having our final exam really soon, here  are some tips to study:
I. Vocabulary words. You need to know the meanings of the following words that you  have already copied in your notebooks:
a. matter
b. element
c. periodic table
d. mass
e. density
f. volume
g. atom
h. property
i. buoyancy
j. pressure
k. mixture
l. solution
m. physical property and physical change
n. states of matter
o. chemical property and chemical change

2. Some other words that you need to know:
a. position: the location of an object. Example: Look at the helicopter's position.

b. motion: when an object keeps changing position. Example: Look at the picture. The man is in motion, it keeps changing position.

c. relative position: the position of one object compared with the position of another object. Look at the picture. What is the position of the Moon compared with the position of the Earth?

d. speed: how fast an object changes its position. Look at the picture. How fast do these cars move? There are two types of speed: constant, when it doesn't change and variable, when the speed changes, they can move faster or slower.

 We measure speed using a speedometer: It tells us the number of kilometers a car runs in one hour.

e. potential energy. It is stored energy that can be used to do work. for example, a battery, when you place it in a toy, it can make the toy move. Look at the picture. The ball at the top of the slope doesn't move, but if it is pushed by a force, it can start moving, rolling down the slope.

When the machine is holding the ball, it has potential energy. When it lets the ball fall, it becomes kinetic energy, as it is falling down.

f. kinetic energy. It is the energy of motion. Look at the picture. As you fall down the roller coaster, kinetic energy is responsible for movement.

You may want to try the roller coaster game which lets you try different combinations to create your own roller coaster. Read the instructions carefully so you can play.

http://rollercoastergamesonline.com/roller-coaster-games/digital-labs-coaster-creator

You need to have Java for this one:
http://www.funderstanding.com/educators/coaster/


The following page contains interesting facts about motion, force and velocity:
http://idahoptv.org/dialogue4kids/season12/force_and_motion/facts.cfm

This page also has games and activities. Try the ones about "sound".

g. friction. It is a contact force that opposes the motion of an object. Friction make objects slow down.

h. vibration. a very quick back-and-forth movement. Vibrations may produce sound. Wind instruments make sounds when air inside them vibrates.

i. compression wave. They are sound waves and look like this:

j. simple machines. Machines help make work easier.  For example:
An inclined plane connects a lower level to a higher level:

A lever is used to lift and move things.

A wedge split helps cut, or connect things.

A pulley changes the direction of how something moves, for example, sailors use them to raise the sail.

II. Check the phases of the moon. What are the waxing phases? what are the waning phases?
Don't forget the names of the planets! 

Good luck!