Biology Report

1. Create heat in three different ways

Material:

Your body

Procedure:

     a. Hug somebody or something
     b. Rub your hands together
     c. Cover your mouth with your hands and breathe

Result: These are some of the ways in which you can create heat easily. The one that requires least effort would be rubbing your hands together, because you could do it while doing something else.

2. How does music instruments create sound? 

How can you change the sound it makes? 

Materials: 
Any kind of string instrument.

Procedure:
1. Try to strum the string without holding the fret.
2. Try to play with a fret held by your hand
3. The sound both process makes would be different

     Result: After the instrument has been strummed, it produces sound. The guitar produces sound from the vibration of the strings due to them being strummed and this causes them to vibrate and produces sound. The kind of sound produced could be changed by holding the frets differently. By changing the fret, we made the string to become longer or shorter than before, and it is one of the factors that affect the sound.

3. Make the ruler stick to stuff after it's been rubbed. 

Materials:
Ruler
Paper
Procedure:
1. Make small pieces of paper from the one you had prepared beforehand
2. Rub the ruler onto your hair
3. Try to attract the paper pieces with your ruler


       Result: The ruler attracted some of the paper pieces due to it having static electricity after it's been rubbed to the hair. This happens because of movements of electrons.

4. Leave some old bread out till it has mold growing on it and describe what you see happening 

           

Materials:

 Bread
Procedure:
1. Get an old bread and take it out from it's packages
2. Leave the bread outside and see what changes happen

       

       Result: The bread grew mold as it was left outside for 3 days. This happened because the bread in good condition was good food for some fungus and bacterias to grow on it.

5. Make bicycle pedaling easier

Materials:

  Bike
Procedure:

1. Pedal the bike normally

2. Observe the gears and different sizes of gears

3. Describe what happens and relate it to the assumed speed of the bike

     Result: The bigger gear in front makes pedaling easier. While the bigger gear at the back makes pedaling harder. So, to make the pedal easier, we could use the biggest front gear, and the smallest back gear.

Radya A.
11 Science GAC