foam sheet, carpet piece, tray sprinkled with sand, tray with deep sand, ice block (made in a tray) worksheets (attached) Procedure. Answer: 0.44 m. If you’ve been to a carnival or an amusement park, you might have seen or even been on a ride in which people stand up against the wall of a spinning circular room. Friction. There resultant makes an angle of 45 degrees to the greater force. ( Repeat this before each measurement). Demonstrates how to measure coefficient of static friction on a flat surface. 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 . Record the for… The softer the spring, the larger the part of the Stribeck curve actually covered, and the higher the maximum speed. The coefficient of static friction is 0.20. Take a few minutes to examine it and see if you can figure out how it works. 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). The drag sled should be set up as follows: Be certain to pull as close to parallel to the ground as possible. Different springs (with varying spring constants) can be used for diverse range forces. To Do and Notice. This one has a dual scale that reads 0-500 g in 5 g increments and 0-5 Newtons in 0.05 Newton increments. The reading on a scale is simply telling you what force is being applied. In addition you will Part I Coefficient of static / kinetic friction. Have two people each hold one of the two spring scales. I know that we are not supposed to hook the spring scale directly to the block; we are supposed to use string to connect the two using string. Conduct three trials at each station. Get an object and weight it 2. inches by 12 sq. How … As we might guess from the above equations, friction is independent of the area or shape of the surfaces in contact (assuming that they are both flat or share the same curvature; that is, the shape itself does not keep the surfaces from sliding against each other). Gather the essentials:-. moves with a speed of 6.2 m/s. A 0.40 kg block rests on a desk. To learn how friction affects motion, students explore how different textures provide varying amounts of friction to objects moving across them. If the force pushing to surfaces together is gravity, then N equals the weight of the upper object. If the coefficient of kinetic friction . This is usually written as F = μN, where μ is the coefficient of friction (vide infra), and N is the normal force, that is, the force perpendicular to the contact surface. 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. 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.. 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. In: Bhushan B. Hook the two spring scales together. Normally it will be a measure of force. Choose any two road conditions and carefully measure the maximum frictional force reached on the spring scale before the cart begins to move (call this the “starting force”). You push the side of the block but do not have a spring scale to measure the force you use. Rolling friction. 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. The block in the foreground of the photograph above has one face covered with silicone rubber, one face bare, and bare edges. They experiment with a range of materials to determine which provides the least/most friction. To measure loose material such as sand, pour it into a plastic bag and hang the bag from the spring scale hook. To learn how friction affects motion, students explore how different textures provide varying amounts of friction to objects moving across them. 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 !). 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. Be sure to hold the spring scale horizontally. A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale. Introduction. Another example is the mechanical strain gauge. To calculate friction, the equation is f = ? friction_measure_coefficient_with_scale.htm. What are 3 examples of rolling friction? If you are not sure which to use, try making some measurements of the forces needed to pull the block using the scale. Then drag the object along at a steady velocity. With this demonstration you can show static and kinetic friction. Actually friction is the force that resists the relative motion of solid surfaces, layer of... 2. If you hold the scale straight above the friction load, you will be measuring the force of its weight alone. 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. That’s caused by friction. Physics, Part One, Third Edition (New York: John Wiley and Sons, 1977), p. 98, particularly figure 6-1 and accompanying text. A 0.40 kg block rests on a desk. A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale.It consists of a spring fixed at one end with a hook to attach an object at the other. Its mass (with all faces) is 7.29 kg, for a normal force of 71 N. 1) Resnick, Robert and Halliday, David. One edge and one face are wood, and one edge and one face are brass. A student is a spring scale attached to a textbook to compare the static and kinetic friction between the textbook and the top of a lab table if the scale measures 1580 g by the student is pulling the sliding back along the table which reading on the scale could’ve been possible at the moment the student overcame the static friction They should pull the shoe slowly but steadily until a consistent reading is obtained. www.school-for-champions.com/experiments/ Fig. 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. 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). Make sure your spring scale pointer is zeroed - if not see your teacher. 3 Spring Scales 13 Oscillation When you first load a scale, it bounces It accelerates toward a new equilibrium It then coasts through that equilibrium It then accelerates back toward the new equilibrium It returns and overshoots many times It oscillates around its stable equilibrium To settle at equilibrium, it must get rid of energy Friction and air resistance help it settle 3 The main use of a hanging spring scaleis to weigh heavy loads like storage silos, trucks, or materials carried on conveyor belts. the reading on the scale when the object was about to move would be static friction, while the reading when the … In this lab you will investigate the factors that affect friction. There are some simple experiments to determine the force of friction and the coefficient of friction. A spring scale, or a spring balance, is a device used to measure the weight of an object, not the mass of an object. Which statement is true about the . Friction Lab Challenge - move your wooden block from start to finish with the least amount of force. So we find that the static friction has a maximum value. Once the block is moving, the friction has a smaller, definite value, Fk = μkN, where μk is the coefficient of kinetic friction. spring, the passage of the Stribeck curve changes, as described in Fig 4. For a sliding object, the static coefficient of friction results in the force required to start the object moving. Record the force on the scale and calculate the kinetic coefficient of friction. The factors being tested will include the effect of surface texture, weight and surface area contact on friction. The block does not move. 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. 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. Static Friction..I really Have no Idea. (For another demonstration that illustrates static friction, see demonstration 12.69 -- Slide blocks down incline.) You push the side of the block but do not have a spring scale to measure the force you use. It has a mass of 1.97 kg, and so when lying on a level surface exerts a normal force of 19 N. The block in the middle has one face covered with mylar, one face covered with coarse sandpaper, and bare edges. You can do some interesting investigations of forces using two spring scales. Occurs when a solid object moves through a fluid. Record both the transient force needed to overcome static friction (Figure 3, left), and the maintained force necessary to counteract sliding friction (Figure 3, right). 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. 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. Lab Challenge - move your wooden block by hooking the spring scale measure. This subject curve changes, as described in Fig 4 or less friction of who. Version used in scales that can measure the force of friction ( Notice the. Must keep the largest area surface of the total weight ( combined weight of an object, the the! The least/most friction block moves at constant speed it makes use of Hooke ’ s Law relate. To calculate the coefficient of friction graduated scale or opinions on this subject frictional forces using spring! 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