Surface Tension & Friction Experiments PDF

Surface tension Discussion questions 1.What is the reason for the rise of water in the capillary tubes? And if the water is replaced by mercury, what happens? Answer: –Because adhesion forces prevail over cohesive forces. –The level of mercury inside the capillary tube will decrease. 2. What is ef...

Surface tension Discussion questions 1.What is the reason for the rise of water in the capillary tubes? And if the water is replaced by mercury, what happens? Answer: –Because adhesion forces prevail over cohesive forces. –The level of mercury inside the capillary tube will decrease. 2. What is effect each of: length of capillary tube and temperature on surface tension? Why? Answer The length of the tube does not affect. While temperature affects, as temperature increases, the surface tension of the liquid decreases. 3. What is the relation between radius of capillary tube and height of liquid? Answer The height increases and the diameter of the tube decreases. Inverse relationship. 4. What is the application of surface tension in medicin? Answer Applications of surfactants in anesthetics and disinfectants. 5.What is the principle of determination of surface tension? Answer The surface behaves like a flexible sheet. 6.What is the conclusion of surface tension? Answer A molecule on the surface of a liquid is subject to attraction from neighboring liquid molecules, such that these forces act in one direction only. 7.Is surface tension a stress? Answer No, but tensile strength is stress 8.What is the principle of tension in physics? Answer According to Newton's law (for every action there is an equal and opposite reaction) Additional questions 1.What are the factors that affect surface tension? Answer: Liquid type and temperature 2.Why did the fluid reach a certain level and stop? Answer: Due to the downward attraction force and the upward surface tension force 3.What is the purpose of the surface tension experiment? Answer: Finding surface tension for problems using a capillary tube. 4.What is the shape of water droplets in a surface tension experiment? Answer: Liquid droplets take nearly spherical shapes. 5.What is the purpose of surface tension in liquids? Answer: A property that makes liquids appear as an extended elastic membrane that has the ability to resist penetration by light objects. 6.Discuss the graph and write the law of surface tension with the drawing. Answer: We note that the relationship is inverse and that it is valuable Al slope Equal (according to the drawing). 9.What are the devices used in the surface tension experiment? Answer: 1. 2. 3. 4. 5. Capillary tube. Baker. ruler. Holder and holder. Distilled water Coeffivent of legal friction between this surface 1. She Coefficient of legitimate friction varying by weighting over the word piece or hot? Answer: yes, when the mass of the weight increases, the force of initial frication in creases 2. which is greater the Coefficient of legitimate friction or slippaye? Answer: The Coefficient of direct friction is greater than the sliding Gefficient because body at rest we need agreater force to move the 3.Is There only friction in Solid materials? Answer: - No, friction exist in all cases. In the gased and liquid states, is it is Called The dray force. 4. The graphic relationship between in the pulling force and The Compressive force, and what do you derive from the graph? Answer: - The relationship is direct between the pulling force 5. what is the unit of the initial Coefficient of Friction? Answer: - with out unity 6. what is the force The acts on a piece of wood to keep it at rest? Answer: -The force of dray is equal to the force of friction 7. what are the factors that affect the coefficient of device? Answer: -1- initial friction Coefficient device 2-piece of wood. 3. Weight bearer. 4-weights. 8.Write the law for the coefficient of direct friction? Answer: 9.What are the devices used in the experimental friction experiment? Answer: A flat piece of wood, 60 cm long. A flat piece of wood measuring 39 cm. String with 10 cm weight holder. Weights of known weight and varying weights. Boyle's law 1.What does Boyle's law state? Answer: The volume of a specific amount of gas is inversely proportional to the pressure when the temperature is constant. 2. What does Boyle's law state? Answer: 3. Is volume a constant or variable according to Boyle's law? Answer: - It changes 4. Why was mercury used in Boyle's experiment? Answer: 1- High density. 2- High grip strength. 3- It can be easily distinguished due to its color. 5. Does Boyle's law apply to vapors as well as to gases? Answer: The relationship between the volume inside a vessel filled with a gas and the pressure under that gas is inverse. 6. Why does the surface of mercury in the tube take a convex shape? Answer: Because the force of cohesion is greater than the force of adhesion. 7.What is the ideal gas pressure? Answer: Pv=nRT Where - P/ pressure V/the size n/The number of moles R/ Ideal gas constant T/temperature 8. What devices were used in Boyle's experiment? Answer: 12345- Two tubes, one of which is closed at the top Rubber tube Metric ruler Holder and holder Mercury