598 WordsSep 4, 20133 Pages

Physics Summative Lab Report
Purpose: To find why few objects float on water where as other sink.
Hypothesis: Objects with a density lower than that of water (1 g/cm³) which is the wooden block, will float on water, where as objects with a density which is higher than water (plasticine) will sink in water.
Apparatus: Measuring Cylinder, Thread, Wooden Block (Cuboid), Plasticine, Water, Electronic Balance and Vernier Calipers.
Variables:
• Independent Variables: Objects Used
• Dependent Variables: Density
• Constants: Time, Temperature, Mass and Volume
Method:
Finding the density of the plasticine (Irregular Objects):
1. Take a piece of plasticine and tie it with thread.
2. Take the piece of the plasticine and measure its mass using an electronic balance.
3. Record the mass of the plasticine.
4. Take a measuring cylinder and fill it with 120 cm3 of water.
5. Now, take the same piece of plasticine tied with thread and immerse it into the measuring cylinder filled with water, by holding the thread.
6. Check the changes in the water level by subtracting the final volume (Current Volume) with the initial volume.
7. Record the change in water level as the volume of the piece of plasticine.
8. Calculate the density by dividing the Mass of the plasticine with its Volume.
9. Use the same piece of plasticine and repeat stages 2-8 twice to make the results more reliable.
10. Calculate the average density by finding the mean of the three densities acquired.
Finding the density of the wooden block (Regular Objects):
1. Take a cuboidal wooden block.
2. Measure the mass of the wooden block using an electronic balance.
3. Record its mass.
4. Take a Vernier Caliper.
5. Now, measure the dimensions of the Wooden Block and multiply them to find the volume of the wooden block.
6. Calculate the density by dividing the Mass of the wooden block with its

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