An experimental study, including three experimental devices, is presented in order to investigate dry friction phenomena in a wide range of sliding speeds for the steel on steel contact. We recently performed an experiment to determine the static and kinetic coefficients of friction by moving a box along a board. Work with a group to investigate friction and to see what happens to the distance a toy car travels when you change the surface at the bottom of a ramp. Friction, experiment and theory the lab this week investigates the frictional force and the physical interpretation of the coefficient of friction. The students will be using a binder and matchbox car to discover how friction effects how far a car will go. As i began looking, i discovered that i had been ignoring this interesting subject.
One newton is the force required to impart an acceleration of 1ms2 to a mass of 1 kg. With support understand what makes a test fair and how to measure accurately. Please practice handwashing and social distancing, and check out our resources for adapting to these times. The friction force allowing an object to stick to a surface that it is in contact with. Forces and friction collection by fizzics education.
Jun 20, 2017 test which surfaces create more friction, see how strong friction is, learn how to reduce friction, and even discover the side effects of friction. Thus, the static coefficient of friction concerns the force restricting the movement of an object that is stationary on a relatively smooth, hard surface. This is an experiment for students dealing with friction, force, and motion. We will make use of the concepts of the force of gravity, the normal force, the frictional force, tension, freebody diagrams, and objects sliding on an inclined plane. Introduction basically, belt friction is a term which use to describe the frictional forces between a belt and a surface, and in this experiment, it will be the frictional force with the surface of the pulley. Motion on an inclined plane is a standard physics example. This weeks experiment is a result of an email from karen h. With no friction people would have a problem with walking, driving a car and etc. Engage your students during remote learning with video readalouds. Pdf mechanics and sliding friction in belt drives with. Belt friction experiment objective to determine the sliding coefficient of friction, between the belt and the pulley. The nature of friction rob wendland, driving mike troxels. The frictional resistance depends on the coefficient of friction i.
We model kinetic friction with fkinetic kfn, where k is the coefficient of kinetic friction. Belt friction is a term describing the friction forces between a belt and a surface, such as a belt wrapped around a bollard. Friction is the force that opposes motion when two surfaces are in contact. Rubber friction is a topic of huge practical importance, e. First you will measure the coefficients of static friction between several combinations of surfaces using a heavy block and a set of hanging masses. It will take students through each step of the scientific method. Friction loss along a pipe introduction in hydraulic engineering practice, it is frequently necessary to estimate the head loss incurred by a fluid as it flows along a pipeline. Administer the fourquestion friction force preassessment to gauge students prior knowledge of the concept of friction and how it affects the motion of objects. You are trying to measure the coefficient of kinetic friction.
Test which surfaces create more friction, see how strong friction is, learn how to reduce friction, and even discover the side effects of friction. Your goal is to determine the force of friction between the plunger and walls of a plastic syringe through the analysis of the work done during a thermodynamic process. In actuality, it is easily proven with a simple experiment. The force of friction we will be completing a formal lab report on the force of friction you will record a rough draft of the investigation in your science notebook your final draft must be typed, double spaced, and have standard margins due beginning of.
The purpose of this experiment was to calculate the coefficient of kinetic friction, the coefficient of static friction, and to verify the relationship between, and the weight of an object. In this experiment, since the coefficient of kinetic friction is to be measured, all cases of constant speed motion of the block must be accompanied by tapping the incline. Factors studied in this experiment is the angle of contact between the belt and pulley. Friction experiments are some of the easiest, inexpensive, and most enjoyable for kids.
Symbols are data from experiments, the dashed line is the carmankozney equation, and erguns correlation is represented by the solid line. Easy science experiments for kids friction science. Determine the relationship between force of static friction and the weight of an object. It is the force of friction we will be concerned with in this experiment.
Explore friction using toy cars teaching resources. These two frictional forces can have two different coefficient constants. Rolling friction is affected by the texture of both the surface and the rolling object. Tell students that they will be designing an experiment to test the effect of friction on different objects.
Both static and kinetic friction depend on the surfaces of the box and the floor, and on how hard the box and floor are pressed together. Place the board to be measured on the conveyor belt and place the friction. All children are familiar with playground slides, which may thus be a good starting point for investigating friction. Measure the coefficients of static and kinetic friction for a particular block and track. On the positive side, friction between the road surface and the car tires is what keeps the car moving along a highway.
She asked about past experiments dealing with friction. You must also develop and deploy a different method that can be used to validate your results. Jun 04, 2012 the lab report friction experiment friction resistance that results when the surfaces rub against each other today, the lab report brought to you by apologia science gives you some simple experiments to help you and your kids understand friction. The friction that exists between the belt and pulley is influenced by several factors such as the following. Inseparable books experiments steve spangler science. Comparing measurements from the starting point to the back of the box in one trial and to the front of the box in another. Whenever two objects slide along each other, friction is involved. Friction is an important force, with positive and negative implications. Friction factor as a function of reynolds number for a packed bed of particles. The force of friction we will be completing a formal lab report on the force of friction you will record a rough draft of the investigation in your science notebook your final draft must be typed, double spaced, and have standard margins due beginning of 2nd quarter exact date tbd. Measure 40cm of length on the lab table surface with the meter stick and mark the start and finish. In my experiment this force was the friction caused by the texture of the ramp.
Measure static sliding coefficient of friction with a ramp. Belt drive experiment objective the objective of the experiments are to investigate the relationship between belt tensions, angle of wrap and coefficient of friction for flat and vbelts. Thus if there is friction it would surely affect our accuracy but for ideal case, the results would be accurate. We model kinetic friction with fkinetic kn, where k is the coefficient of kinetic friction. Determine belt friction using belt friction apparatus. There are sliding friction experiments, a phone book friction experiment, a way to make rice stick together, an experiment to create frictional heat, and lots more friction experiments for all ages. Next, you will measure the coefficient of kinetic friction between two.
The direction of the friction force is always opposite to the direction of motion or motion attempt and parallel to the surface, therefore it resists the relative motion of the surfaces. Then, to determine the effect of the angle of warp to the power that can be transmitted for. R contact symbolizes the electrical resistance through the asperity contact of the piston ring and the cylinder liner andor the oil film. Pdf experimental measurement of the friction torque on.
What a cool and easy way to experiment with friction. Then the empirical data may be compared with the theoretically derived solutions and the coefficients of friction evaluated for all the belts types. If we take ideal pulleys that is with zero friction then the extra tension due to friction would disappear and we would get the most accurate result. Friction is an important phenomenon in everyday life. This super experiment is called suspended rice but get an adult. If friction exists between the rope and the surface though, the friction force will oppose with sliding motion, and prevent it up to a point.
Did you know you can suspend rice in the air with just a pencil. Static and kinetic friction objectives use a force sensor to measure the force of static friction. In some instances we used a pulley and weights to find the static and kinetic coefficient of friction and in the last part we inclined the board and gave a slight push until the box slid down at a constant speed. Friction, experiment and theory mcmurry university. It can be classified in to two categories, static friction and kinetic friction. To measure the coefficients of static and kinetic friction between a wooden block and a wooden plane. General physics i lab page 1 of 6 pcccascade experiment. However, from our everyday experience with motion, we know that friction must be taken into account for a realistic description of practical situations it is something we cannot ignore. Below are my favorite and super cool friction activities for kids. The coefficient of friction between the belt and the pulley depends upon following factors. In this experiment, you will use a force sensor to study static friction and kinetic friction on. For many open channels found in civil engineering problems the channel walls are very.
Take a brick, lay it on a table with its large area down, and apply a force until it just begins. This is tested by releasing a toy car down a track and measuring the amount of time it takes for the car to get to the bottom. Experiments the simplest experiment showing the existence of friction and its properties was first described by galileo. The tension will vary throughout the length of the belt which is in contact with pulley. Procedure this experiment requires you to record measurements in newtons.
The object of the experiments is to test flat belt with varying angles of lap around a pulley. This paper presents investigations of friction by a group of 11year olds. The lab report friction experiment the homeschool scientist. Mechanics and sliding friction in belt drives with pulley grooves article pdf available in journal of mechanical design 1282 march 2006 with 7,163 reads how we measure reads. Check out this easy friction science experiment that packs a big punch. If the surface of the pulley is perfectly smooth, the tension in the belt on both sides of the pulley will be same i. How does friction between strings and pulley affect results. Now we want to repeat the experiment keeping the force constant and changing the mass of the cart to see how mass affects the acceleration.
Experiment 6 the coefficient of friction equipment. If there is a difference between the values, explain it. Give students the box of materials and the attached friction lab worksheet. This website and its content is subject to our terms and conditions. Experimental measurement of the friction torque on hydrodynamic plain journal bearings during startup article pdf available in tribology international 4478. For example, it may be desired to predict the rate of flow along a proposed pipe connecting two reservoirs at different levels. Friction slows the ball to a stop while preventing your feet some sliding out from under you. Newtons laws, maximum static friction, kinetic friction, coecients of friction. I recently did the following experiment for ap physics 2. Motion on an inclined plane and the nature of science.
Friction is the resisting force which opposes the motion or attempted motion of one body over another. Theory friction is the force that resists the relative. Friction lab report title of experiment static and kinetic. The circuit is fed with a current u f of 50 mv dc see fig.
What is the independent variable in this experiment. A ballistic setup, with an air gun launch, allows to estimate the friction coefficient between 20 ms and 80 ms. With equal tensions on each side of the belt, only a nonuniform normal force exists between the belt and the surface. A belt is passing over a pulley and hence the belt is in contact with the surface of the pulley. On to the first experiment using the diy force scale.
This caused the marble to slow down when the more textured surfaces created more friction. He noted that the friction is caused by rough surfaces. Appendix b logger pro objective to measure and analyze the coecients of friction s and kbetween a wood block and wood plane. Cars down a ramp friction lab by the teaching chick tpt.
Dec 06, 20 jared discusses friction and then uses blocks on a ramp to show us the effects of different surfaces. This variation in tension is due to frictional resistance. Figure 1 shows the force of friction between two surfaces. Lab 3 belt friction experiment belt mechanical friction. This is a description of an experiment that tests how lubricants like water affect speed. This causes vibration in the system and avoids the measurement of the coefficient of static friction instead. The effect of surface texture science fair experiments. A v belt pulley as shown below is used to transmit a.
In this lab, you will make some basic measurements of friction. Mar 23, 2011 created on march 23, 2011 using flipshare. When one end of the belt is being pulled only part of this force is transmitted to the other end wrapped about a surface. Friction is the reason you cant roll a ball for eternity with one toss, but its also what enables you to run as you press your feet against the ground. Friction in previous labs we studied newtons laws in an \ideal setting, that is, one where friction and air resistance were ignored. The voltage u contact is linearly correlated with r contact, this voltage is used to represent the electrical resistance in further analysis, it is later sections referred to as resistive. Determining the coefficient of friction succeed in physical science static friction is the force that holds back a stationary object up to the point that it just starts moving. Notice that there is a different coefficient for static and kinetic sliding friction. Experimental friction evaluation of cylinder linerpiston. Abstract a new insight into the mechanics of belt friction is given.
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