Make any other measurement(s) you need to calculate the coefficient of friction for each road condition. The block does not move. You will drag a wooden block by hooking the spring scale to it at one end and pulling it across the surface for 40cm. Then drag the object along at a steady velocity. Introduction. To learn how friction affects motion, students explore how different textures provide varying amounts of friction to objects moving across them. Force of Sliding Friction (measured in Newtons) ... Force of Friction Lab Report Materials: 1-4 Wooden Blocks 0-2.5 Newton Spring Scale 0-10 Newton Spring Scale 1 piece of waxed paper 1 piece of paper towel 1 piece of fine sandpaper 1 piece of coarse/rough sand paper 1 rubber band Masking tape. It consists of a coiled spring which gets stretched when a force is applied to it. In this lab you will investigate the factors that affect friction. Materials Needed : 4 wood blocks for each lab group (approximately 2 inches x 3 inches x 6 inches is a good size because then the ratio of areas of the different sides is simple- 6 sq. Hence, there are two manifestations of friction: static friction, which acts as long as the object is still at rest, and kinetic friction, which acts as long as the object is moving. You will measure frictional forces using a spring scale to measure the force. A spring scale, or a spring balance, is a device used to measure the weight of an object, not the mass of an object. Spring Scales. This means also that with a softer spring μ reversal becomes smaller in mixed friction and the term describing the tendency to stick-slip becomes higher. Attach an item to the leader line of the spring scale. it measures upward force needed for equilibrium. NATO ASI Series (Series E: Applied Sciences), vol 330. By modifying the bottom surface of the cup, students find out what kinds of surfaces generate more or less friction. 3. How to Measure Friction Using a Spring Scale 1. ( Repeat this before each measurement). How … With this demonstration you can show static and kinetic friction. The block in the foreground of the photograph above has one face covered with silicone rubber, one face bare, and bare edges. Springer, Dordrecht www.school-for-champions.com/experiments/
Demonstrates how to measure coefficient of static friction on a flat surface. One way to determine the coefficient of friction between two surfaces is to pull on an object, using a spring scale that is used to measure weight. Procedure - 1. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position. For example, you could find the friction between wood and steel, wood on wood, rubber on wet pavement, and so on. In addition you will investigate the difference between “Static” and “Kinetic” friction. You will measure friction using a simple device called a spring scale. Note that you must record what the two surfaces are. Directions: Zero your spring scale This is done by moving the metal tab at the top of the scale up or down until the reading is zero. Which statement is true about the . Physics The spring scale was not pulled at a completely constant speed, or pulled completely horizontal. A 0.40 kg block rests on a desk. Actually friction is the force that resists the relative motion of solid surfaces, layer of... 2. Overall, it was determined that mass Overall, it was determined that mass Barnhart 9 will change the force of friction on an object, but speed and surface area will not have an effect . (Notice: The School for Champions may earn commissions from book purchases). The factors being tested will include the effect of surface texture, weight and surface area contact on friction. Once the block is moving, the friction has a smaller, definite value, Fk = μkN, where μk is the coefficient of kinetic friction. Bowling, car, and bike. 1) Use a 5 N spring scale to measure the weight of the wooden box, and record your result. Pull on the spring scale until the object begins to move 4. Measure the maximum static friction force by using the Newton scale. Material. Measuring friction in different shoes: Show students how to measure the friction between a shoe and their desk, by hooking the spring scale through a strap or lace on the front of the shoe, then using it to pull the shoe along. 3) control variables 4) Recognize that some things are hard to measure like friction because the spring scale needle vibrates. You must keep the largest area surface of the block in contact with the friction surface at all times. Stronger springs are used in scales that can measure thousands of kilos. moves with a speed of 6.2 m/s. Its mass is 1.88 kg, to give a normal force of 18 N. The block at the rear is made of aluminum, and its edges and faces are snap-in panels. Spring scale Shoe Different surfaces . If you hold the scale straight above the friction load, you will be measuring the force of its weight alone. Record the force and calculate the static coefficient of friction. Static Friction..I really Have no Idea. It makes use of Hooke’s Law to relate the stretch on the spring to the pulling force. Click on a button to bookmark or share this page through Twitter, Facebook, email, or other services: The Web address of this page is:
The coefficient of static friction is 0.20. It acts opposite to the direction of this applied force, and depends linearly on the force that acts to keep the two surfaces together (which is perpendicular to the applied force). An object's mass refers the amount of … The reading on a scale is simply telling you what force is being applied. Friction Lab Friction is a force that occurs when two surfaces TOUCH. I will try to get back to you as soon as possible. They build a tool to measure the amount of friction between a note card and various surfaces by measuring the distance that a rubber band stretches. x N (friction force equals the coefficient of friction times the Normal force (weight in Newtons if object is perpendicular to the earth’s surface)). Typical high school physics experiments that investigate friction coefficients usually use a weighted mass that is dragged across a surface and is attached to a spring scale; the spring scale measures the frictional force occurring in the system. One way to determine the coefficient of friction between two surfaces is to pull on an object, using a spring scale that is used to measure weight. 3.You will need to decide which spring scale to use for your measurements. A spring scale measures weight or force when an object is hung from its hook. Friction. The Force, Motion, and Spring Scales Pack from Beaker & Book addresses concepts relating to force, motion, gravity, and friction. That’s caused by friction. You use a spring scale to measure the force that the string exerts on the plane to be 5.0 N. Predict the radius of the plane’s orbit. A scale is a force indicator. Purpose: Measure the kinetic friction and static friction for wood blocks on wood surfaces. we can use a spring balance to determine the force of friction. friction coefficients usually use a weighted mass that is dragged across a surface and is attached to a spring scale; the spring scale measures the frictional force occurring in the system. Small scales with sensitive springs can be used to measure differences of up to a gram or less, though these will break if heavy weights were attached to them. It consists of a spring fixed at one end with a hook to attach an object at the other. Normally it will be a measure of force. Complete the table of the total weight (combined weight of block and mass) vs. the Pull Force. Use these measurements to compare the static coefficient of friction with the kinetic coefficient of friction you have already measured. The reading on the scale gives the magnitude of the force. Physics, Part One, Third Edition (New York: John Wiley and Sons, 1977), p. 98, particularly figure 6-1 and accompanying text. But I am unable to recall why this is. Questions; Physics . They experiment with a range of materials to determine which provides the least/most friction. Factors in Getting an Idea for a Science Project, Determine Reasons Students Get Poor Grades, Measure Coefficient of Friction with a Ramp, Overview of Static Electricity Experiments. Two identical spring scales, like those used to weigh fish, or those found in physics class. A classic version used in high school labs is the spring balance. By using a scale, you can measure the coefficient of friction. Measure and mark off another 27-cm length on the bare tabletop. Do this for at five different masses listed below. friction_measure_coefficient_with_scale.htm. N, as noted above, is the normal force, which for our block, is just mg, where m is the mass of the block, and g is the acceleration of gravity (9.8 m/s2). You push the side of the block but do not have a spring scale to measure the force you use. Don't be wasteful; protect our environment. Fig. If we attach a spring scale to one of the blocks shown above, and try to pull it across the table, we find that it takes a certain force to accelerate the block from rest. Its mass (with all faces) is 7.29 kg, for a normal force of 71 N. 1) Resnick, Robert and Halliday, David. spring scales, 1.5kg or 1kg maximum, if using up to 500g weights, or 2kg if using up to 1kg weights (one per student group) desks and classroom floor to work on; other surfaces to measure friction on e.g. Hold the spring scale as close as possible to the surface of the water without touching it. Hook the two spring scales together. The coefficient is then where Wis the weight of the upper object. Students use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor. In order to measure force of friction with a spring scale, you will need a spring scale, a... 3. 3 The main use of a hanging spring scaleis to weigh heavy loads like storage silos, trucks, or materials carried on conveyor belts. Then, using the spring scale, apply a HORIZONTAL force to the box to pull the box at a constant, slow velocity along the HORIZONTAL friction plane (NOT along the classroom table !). Using the online-encyclopedia Wikipedia as an example, we discuss several methods that can be applied to analyze the dynamic nature of knowledge-related processes in mass collaboration environments. The School for Champions helps you become the type of person who can be called a Champion. In addition you will how does a spring scale measure weight? (For another demonstration that illustrates static friction, see demonstration 12.69 -- Slide blocks down incline.) 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