Lab Report of Archimedes Principle

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Experiment 7 Title: Archimedes Principle Objective: To use Archimedes principle to determine the density of an object more dense than water. Introduction: A body wholly or partly immersed in a fluid is supported by a force equal to the weight of the fluid it displaces. The buoyant force can be considered to act vertically upward. Archimedes principle is important for the construction of ship, submarine and so on. Materials: newton gauge, metal samples, beaker, and measuring cylinder electronic balance. Method 1: Determine the weight of each object by using electronic balance. Method 2: Pour some water into the measuring cylinder, recorded the values, and put the object into the measuring cylinder. Measure the increase of volume, which is the volume of object. Results Type of mass | Vol. before adding load/cm3 | Vol. after adding load/cm3 | Difference | Mass/g | Mass in water/g | Density of sample /gcm3 | Pendulum bob | 60 | 64 | 4 | 29.56 | 25.56 | 7.39 | Small screw nut | 60 | 61 | 1 | 7.92 | 6.92 | 7.92 | Big screw nut | 60 | 63 | 3 | 21.38 | 18.38 | 7.13 | Marble | 60 | 62 | 2 | 5.21 | 3.21 | 2.60 | Magnet | 60 | 66 | 6 | 29.40 | 23.40 | 4.90 | Discussions Here are some working step which is related to Archimedes principle from this experiment, taking pendulum bob as an example. -From begging, we prepared 1g/cm3 ,density of water from 100ml of water. P=mv ,100g100cm3 =1 g/cm3 To find the density of pendulum boband reason why the pendulum bob will sink… a) Mass of water displaced =pv =1 g/cm3 x 4cm3=4g b) Mass of object in water=25.56g c)Mass of object in air =mass in water + mass of water displaced =25.56g+4g =29.56g(same as the reading in electronic balance for pendulum bob) d) Density of object =mass of object in airvolume displaced=29.56g4cm3=7.39 g/cm3 e) buoyant force=weight fo water displaced

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