Friction Objectives: To provide an understanding of the concept of friction. To calculate the coefficient of friction of an object by two methods. Materials: Ramp board: 3 - 4 feet long, 10 cm wide Can of soft drink or item of similar weight Friction block set-PK Protractor Scale-Spring-500-g Tape measure, 3-m Lab notes: Using the wooden block provided in LabPaq, a long board, a can of beans and the 500-g spring scale I will try and determine the force of kinetic friction, N, and the force of static friction, N while pulling the block at a constant speed. I will convert kg-mass to Newtons by multiplying the kg-weight by 9.8 m/s2, i.e., 100 g = 0.1 kg = 0.1 x 9.8 = .98 N. Observations: Mass of block (with can): 3995 kg Weight: 3.91 N Data Table 1: Flat board Flat board Force of Kinetic Friction, N Force of Static Friction, N Trial 1 1.1 0.6 Trial 2 1 0.7 Trial 3 1 0.9 Average 1.03 0.73 Data table 2: Flat board - Block Sideways Mass of block (with can) 3995 kg Weight: 3.91 N Flat Board - Block sideways Force of Kinetic Friction, N Force of Static Friction, N Trial 1 1.3 1.4 Trial 2 1.1 1.5 Trial 3 1.1 1.1 Average 1.2 1.5 Data Table 3: Different surfaces Surfaces tried: Glass surface Force of Kinetic Friction, N Force of Static Friction, N Trial 1 0.4 0.1 Trial 2 0.4 0.1 Trial 3 0.4 0.2 Average 0.4 0.13 Data Table 4: Different Surfaces Surfaces tried: Sandpaper Force of Kinetic Friction, N Force of Static Friction, N Trial 1 2.2 1.5 Trial 2 2.1 1.7 Trial 3 2 1.1 Average 2.1 1.43 Data Table 5: Different Surfaces Surfaces tried: Wood on Carpet Force of Kinetic Friction, N Force of Static Friction, N Trial 1 1.4 1.9 Trial 2 1.5 1.6 Trial 3 1.5 1.7 Average 1.47 1.73 Data Table 6: Raised Board Height Base Length θ max μs Trial 1 .44196 m .71120 m 60 deg 0.62143 Trial 2
Make sure the launch range is clear of any obstructions. 2. Using the Plumb Bob and sticky note, mark the floor underneath the launch point. Measure the height of the launch point using the metric ruler once per person and take an average. 3.
• Use the Relative Humidity/Schoenbein Number Chart as follows: o Along the bottom of the chart, find the point that corresponds to the Schoenbein Number. o Draw a line upward from the Schoenbein Number until it intersects the curve that represents the correct relative humidity. o Draw a line from the intersection to the left side of the chart. Note your ozone concentration. Analysis and Conclusions Your report (200 word minimum) on this lab activity should include the following: o The location of your study area.
We used .112 moles of bromobenzene, and .0103mole of magnesium moles of Methyl benzoate was the limiting reagent in the experiment. In calculating the theoretical yields. We used the limiting reagent multiplied by the molecular weight of the product. The initiation of the Grignard reaction began after about ten minutes of gentle heating was applied to thereaction flask containing the crushed magnesium turnings and first portion of the bromobenzene/anhydrous diethyl ether solution. This initiation was evident by cloudiness and graying of solution as well as the evolution of bubbles off the surface of the metal.
Anh Le 10SC Bio Where are the stomata? Aim: To determine where the water comes out of the leaf or not which would explain where the stomata are located. If yes, water does come out then where? Variables: Independent: Side where the Vaseline is applied to: Where you place the vaseline if you apply it or not will determine if the water vapor will escape or not will enable you to measure the weight change. Dependent: Weight of the leaves: First of all you find the original weight of the leaves.
Alex Pascal Lab Partners: November 12, 2009 Period 8 Periodicity in the Properties of Some Representative Elements Purpose: The purpose of this lab was to if elements in the same family react similarly. Procedure: A) A test tube, test tube rack was acquired. A small amount of HCl was measured in a graduated cylinder and poured into test tube. Then a bunsen burner, a small amount of Mg ribbon and a wooden splint was acquired. The Mg ribbon was then placed in HCl in the test tube and observed.
These weights hang off the sides of the wheels and pull on the string at different angles, the objective is to find the point at which all the weights pull on each other so the center of the string is in the center of the force table. This was found in the lab by slowly adding weights till the right mixture was found. The forces are recorded and then shown through vectors. Adding the Vectors up shows that you have a system of equilibrium or not, depending if there is a gap between the first and last vector. The results came out to be complete vectors with the corresponding degrees of the angles with we experimented on.
Jose Flores 6th period 1-27-14 LAB REPORT Introduction: A substance can conduct an electrical current if it is made of positively charged and negatively charged particles that are free to move about and is called a conductor. The purpose is to figure out conductivity of substances and to check which one conducts electricity. The hypothesis is that sucrose would be the only one that could not conduct out of the other six solutions. Materials: The materials used in this lab where six solutions , napkins, 2 pairs of gloves, 2 cups (1 cup with distilled water and 1 cup with solid NaCI) and a conductivity meter. The six solutions are sodium chloride, hydrochloric acid, sodium hydroxide, acetic acid, ammonia and sucrose.
The maximum frictional force that must be overcome before movement is able to begin is μsFN. If you apply a constant force to pull an object along a horizontal surface at a constant speed, then the frictional force opposing the motion is equal and opposite to the applied force, Fp. Therefore, Fp = Ff. The normal force is equal and opposite to the object’s weight when the object is on a horizontal surface and the applied force is horizontal. The question to be answered by performing this lab is how can the coefficient of static and kinetic friction be determined for an object on a horizontal surface?
Velocity field The non-dimensional axial velocity in the swirl tube is shown in Fig. 11 for seven axial positions compared to experimental data. Additionally, a contour plot of the DES visualizes the flow field. The flow direction is from left to right and the velocity legend is defined on top of each figure. The axial velocity shows an axial flow on the tube periphery, whereas in the core a backflow is visible.