Spring Scales Tray Ruler Procedures Lifting Force, Static Friction, Sliding Friction 1. 7. LEVER LAB Part 1 - 1st Class Levers In this part of the lab you will find out how changing the position of the resistance arm affects the mechanical advantage. Once the lab exam begins, you are not permitted to receive any assistance from your TA or other students. Hang masses from springs and adjust the spring stiffness and damping. Your answer will be graded based on the accuracy of your result and proper reporting of uncertainty, significant figures, and units. Place the object in the tray c. With the spring scale, lift one side of the object 10 cm off the tray d. F spring … For the parent-teacher on a budget, we offer economical triple beam balances and electronic digital scales. Assume that the spring scale is being pulled down similar to each of your labs. Use Newton’s Third Law to explain your observations in Post-Lab Questions 1 and 2. Use the balance or electronic scale (but not the spring scale) to determine the mass of the rubber ball in kg, and write it in the space below. Or see how the physics behind them works with mechanical balances and scales, including models from Ohaus. A spring scale works on a principle discovered in the 17th century by Robert Hooke. It makes use of a "vernier scale" which allows one to make more accurate measurements than a simple pointer and scale apparatus. • Hands-on labs require the materials listed below. In the photo which labeled part is the fulcrum C B D A 15.what is the effort force in the lab photo? NCERT LAB MANUAL QUESTIONS. Use the search engine to help you find a particular lab. a) 60 grams b) 10 grams c) 600 grams d) 0 grams. Answer: It has no unit, as it is a ratio of similar quantities. inches by 24 sq. Each scale will read 10 kg B. Digital readouts: The next most common case involves measurements made with a digital readout. The spring force becomes. Pull the box with the spring scale at constant velocity, exerting the force at an angle of 30° to the horizontal. Our selection of lab scales include precision balances, analytical balances and moisture analyzers. This causes the spring to stretch as shown. Click on the picture or the program title to go to the program or click on "See Resources" to see a description of the program and all the resources that go with this program. Measure the length of the ramp (inclined plane) in meters; record. Purpose: In this lab we will experimentally calculate the mass of a suspended weight by placing the weight in static equilibrium and measuring the tension in 6 locations. Tie a string around one side of your object and attach it to your spring scale b. 2.Compare the magnitude of the forces on both spring scales after you pulled the 10 N spring scale suspended on the 5 N spring scale. (I recorded the height on the lab write-up for you). ... Measure the tension on each spring scale and record your answer to two decimal places. 1. In this packet, we’ll answer questions like this: What do scientists mean when they say error? The springs are 6 cm long and 0.8 cm in diameter. Procedure: Set up the inclined plane so the height of the ramp is 30 centimeters. A spring scale will be used to measure the resistance and the effort involved. Spring Scale Lab Adapted from Minds on Physics: Inquiry Activity #41 &Concepts & Challenges:Physical Science Using a Spring Scale, page 253 Goal: In this activity you will learn to use a spring scale to measure the weight (force of gravity) in newtons. For this lab in particular, a disadvantage is that some of these objects are not made to hook onto a spring scale, thus skewing the results. Based on your lab work, determine the mechanical advantage for each pulley system. Lab Materials . 1. inches by 12 sq. 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. Hooke's law is a law of physics that states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring. Up to that point, friction has been merely balancing the force we are applying with the spring scale. The scale on earth reads 60 grams. A realistic mass and spring laboratory. The 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. In this lab you will investigate the factors that affect friction. Having trouble with this tricky physics problem, anyone have an idea of what the answer would be? Spring scales can be used to measure a variety of forces. Then, calculate the weight needed to lift each load in the pulley systems. How can a measurement that is uncertain be useful? Then place the pumpkin on the spring scale and record its weight. Three springs have a spring constant of 5 N/m and the other three have a spring constant of 15 N/m. Which type of simple machine is pictured here? The second team member will hold the third string-loop and its spring scale, adjusting the position of the string's loop on the washer until the spring scale reading is between 10 N and 20 N. When equilibrium has been reached, the third member will slip a piece of unlined paper under the washer and use dots to mark the center of the washer as well as the positions of each string. A chart shows the kinetic, potential, and thermal energy for each spring. A spring generates a force proportional to how far it is stretched (and acting in the opposite direction to the stretch) F spring = −k × stretch If we adjust the coordinate system so that x = 0 corresponds to the spring being unstretched, then the stretch of the spring is simply equal to x. Explain your answer using a force diagram and net force equation. 20. Give the value of the pull force that you measured. A vernier scale can usually be read to only about ± 1 division. inches). A. Inclined Plane Lab ... Once the inclined plane is set up, a cart is placed upon the inclined plane. 3) control variables 4) Recognize that some things are hard to measure like friction because the spring scale needle vibrates. At the grocery store, you put a watermelon on a produce scale. In this lab, we will use spring Pull on the spring scale until you have a good kinesthetic sense of a one Newton force. Thus, the spring scale/string is in static equilibrium. • Dry labs have no required materials. Introduction Lab Options . So we find that the static friction has a maximum value. How can we tell if our measurements have been affected by error? Find the force required to lift your object. 0.008 kg Suppose the ball was floating in outer space (away from the gravity of the earth, friction, or any other influence) and that Newton's Second Law holds. To the 200 line. Calculate the efficiency (work lifting the mass/work pulling the spring scale x 100%) and mechanical advantage (weight lifted/spring scale force) for one trial of apparatus A & B (and C if you did it). You need to hang enough mass to the end of the spring to get a measurable stretch, but too much force will permanently damage the spring. Attach one end of the string to the cart and the other end to the spring scale. Then calculate what the friction force must have been. Homework Statement A 20-kg fish is weighed with two spring scales, each of negligible weight. October 2016 1 of 5 . With nothing attached to the hook, make sure the scale reads zero. Ruler (c) Clay block (d) Wooden cube and clay (b) Spring scale (a) 14. 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. A spring scale is used to measure the mass of an object on earth. Below are all the labs available on this site. 3. An advantage would be the accuracy of a spring scale… Lab Manual • Each lab contains complete instructions – there is no lab … Answer: When the spring balance with stone is immersed in water, the stone experiences an upward force called buoyant force. Answer the questions on the data table page. This mass is also in static equilibrium. Appendix B. When our block is at rest, and we pull it with the spring scale, as we increase the tension the block stays at rest, until we reach a point where it begins to move. This course includes the option of hands-on or dry lab activities. Be sure to clamp the ring stand to the lab table, or weight it with several books so that the mass does not pull it off the table. Transport the lab to different planets. Cart meter stick 5 N & 10 N spring scale. On the moon the scale would read. 4. You can even slow time. This accessory kit contains 6 springs that are ideal for physics experiments. Lab 7 Buoyancy Experiment Type: Cookbook Overview In this experiment, ... Part III: Finding the Specific Gravity (using a spring scale) Now let’s use our knowledge of the buoyant force to determine the density! Laboratory scales for scientists and laboratory professionals. How can we use measurements that we know contain errors or uncertainty to make valid predictions or reach How far will the spring stretch if you add another watermelon of equal mass? a. A spring scale is used to exert a force ... the entire class works together and compiles data in an effort to answer a … Both the resistance and … ... Also, answer any questions which the TA assigns. Make chemistry labs easier easy with a digital scale! Friction Lab Friction is a force that occurs when two surfaces TOUCH. Hold the spring scale in the vertical position with the small hook downward. However, you may use your lab manual, graded lab reports, notes, and textbook as resources for this exam. You will measure frictional forces using a spring scale to measure the force. Student Exploration: Determining a Spring Constant Prior Knowledge Questions 1. Question 1: Why does the pointer of a spring balance move up when the stone suspended from it is immersed in water? Are measurements ever exact? What will be the readings on the scales? Liquid water is more dense than ice because a) A liquid H 2 0 molecule has more mass than an ice H 2 0 molecule. 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