Science Worksheets for Grade 6: Investigating Pulleys

Investigating Pulleys
How do different pulleys differ?

Materials:

• Pulley
• Small plastic bag
• Broomstick or mop handle
• 200 gram weight
• 2 meters cord or string
• Spring scale 
• Chair

Procedure:
A.

1. Put two chairs back-to-back 1 meter apart.
2. Place the stick across the top of the chair. Attached one end of the cord to the center of the stick.
3. Place the cord through the pulley so that the wheels ride freely. The cord will serve as a track. This is movable pulley.
4. Attached the weight to the pulley. Then attach the spring scale to the end of the cord and pull up as shown in figure 7.68
5. Read and record the reading on the spring scale.

B.

1. Attached one pulley to the center of the stick using a short piece of cord.
2. This will be the fixed pulley refer to figure 7.69.
3. Tie one end of the cord to the stick. Pull the cord through the movable pulley up through the fixed pulley.
4. Attach the free end of the cord to the spring scale. Attach the weight tied in the bag to the movable pulley. Pull and read the scale.

What you have found out:
1. Compare the effort force in the movable pulley in the block and tackle.
2. What is the function of the fixed pulley in the block and tackle?
3. What is the advantage of using pulley?


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Credits: Arcelle Yuan