# Static and kinetic friction lab pdf

Lab 4 static and dynamic friction clark university. Note that fk 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. Static friction is the force that is acting to prevent the box from moving. You are trying to measure the coefficient of kinetic friction. Friction is a force that opposes relative motion between systems in contact. In this experiment, you will use a force sensor to study static friction and kinetic friction on a. We increased the mass of the hanging object to find the static friction. Friction, work, and the inclined plane 39 friction, work, and the inclined plane objective. To measure the coefficient of static and kinetic friction between a block and an inclined plane and to examine the relationship between the planes angle and its mechanical efficiency. To determine the coefficients of static friction and coefficients of kinetic friction between each of the four sides of a friction block and a sheet of copier paper, including estimates of uncertainty in the coefficients. In this experiment, you will use a force sensor to study static friction and kinetic friction on a wooden. This is commonly observed when noticing that heavier objects of the same shape and size are generally harder to push than lighter ones. In this experiment, you will use a force sensor to study static friction and kinetic friction on a wooden block. If you apply a light horizontal push that does not move the box, the static friction force is.

This causes vibration in the system and avoids the measurement of the coefficient of static friction instead. Friction can be described as the behaviour that impedes an objects motion when sliding or attempting to slide in contact with another object. An object that is in motion is subject to kinetic, or dynamic, friction. We model kinetic friction with fkinetic k n, where k is the coefficient of kinetic friction. Static friction is the force that is counters your force on the box. The answer will depend on the data recorded and can be calculated using the equation. Thread one end of the loop through the hole in the holding bracket on the front of the cork bottomed tray. In this lab we will study frictional forces between various objects on different types of surfaces. In this lab, you will make some basic measurements of friction. Next, you will measure the coefficient of kinetic friction between two of the combinations of surfaces you used in the static friction part of this experiment. The static friction rises steadily while the object remains stationary, and it drops down to kinetic friction when the object is in motion.

Experiment 6 the coefficient of friction equipment. Prelab what is the coefficients of kinetic friction and the coefficient of static friction for the pair of. To determine the coefficients of static friction and coefficients of kinetic friction between each of the four sides of a friction block and a. The force of friction acts against the direction of motion. Our purpose in this laboratory is to investigate the laws that govern friction. Collected data during the experiment, the wooden box was measured to be 0. We observe that both kinetic and static friction are dependent on the normal force, and a coe cient of friction, s for static and k for kinetic. Kinetic friction coefficients are generally less than static friction coefficients, which is the reason that it is much easier to keep a heavy object in motion than it is to start it in motion 4. You will measure frictional forces using a spring scale to measure the force. This lab will use several methods to determine the coe. For a given surface, the kinetic friction is also proportional to the normal force. Kinetic friction and static friction physics problems, forces, free body diagrams, newtons laws duration. Static and kinetic friction introduction in this lab we study the e ect of friction on objects. 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.

Kinetic friction is the frictional force acting between two surfaces which are in motion against each other. Static and kinetic friction if you try to slide a heavy box resting on the floor, you may find it difficult to get the box moving. The factors being tested will include the effect of surface texture, weight and surface area contact on friction. Haptics is the science of applying the tactile sense to. Static friction is the one present between two objects that are not moving with respect to each other. To learn how to measure the coefficient of frictions for various materials to explore the relationship between static and kinetic friction. If you try to slide a heavy box resting on the floor, you may find it difficult to move. Friction between our foot and the floor helps us walk. Both the traditional physics laboratory and the visuohaptic lab.

In this lab, you will use a force sensor to observe and measure the static and kinetic friction, and then calculate the coefficients of static and kinetic friction. View lab report lab 05 static and kinetic friction. It is, at its maximum, greater than kinetic friction. In this note, a ball oscillating on a concave trackway is used to find the coefficient of rolling friction. Force of the static and the kinetic friction problems and solutions. Static and kinetic friction objectives in this lab you will investigate how friction varies with the applied force. Static and kinetic friction introduction in this lab we study the concept of friction between objects. Solved problems in newtons laws of motion force of the static and the kinetic friction. The basic definition of friction is relatively simple to state. Determining force of kinetic or sliding friction and static friction. Kinetic friction coefficients are generally less than static friction coefficients, which is the reason that it is much easier to keep a heavy object in motion than it.

This simple experiment can be carried out by students and the results are highly reliable. In this lab you will investigate the factors that affect. Difference between kinetic friction and static friction. Force of the static and the kinetic friction problems and. In this lab, you will measure the coefficients of friction between the block and a wooden board. Connect the force sensor and the motion sensor to pasport inputs on the 850 universal interface. When one body lies at rest on a surface and an attempt is made to push it, another type of friction, static friction. Aug 31, 2015 difference between static and kinetic friction definition of static friction and kinetic friction.

These values of static friction force and sliding friction force can be obtained from the software program which accompanies the lab interface. Pdf this paper describes a quick, simple, and reliable physics lab exercise for. For example, the coefficient of kinetic friction between iron and copper is 0. To experimentally determine the coefficient of kinetic friction of a block with four distinct sides using a force meter. Pdf feel the static and kinetic friction researchgate. In liquids, friction is the resistance between moving layers of a fluid better known as viscosity.

Chapter 4 lab report friction block lab names of team members. Understanding how to differentiate between static friction and kinetic friction. Crooms physics lab 069 friction notebook lab purpose. Friction lab friction is a force that occurs when two surfaces touch. P friction forcesare parallel to the surfaces in contact and opposemotion or impending motion. A simple lab exercise to determine the coefficient of static friction article pdf available in the physics teacher 442 february 2006 with 1,639 reads how we measure reads. Apply the concepts of static and kinetic friction to problems involving constant motion or impending motion. Newtons laws, maximum static friction, kinetic friction, coecients of friction. Friction is usually distinguished as being either static friction the frictional force opposing placing a body at rest into motion or kinetic friction the frictional force tending to slow a body in motion.

Connect the force detector to a block of wood pull gently on the force sensor unit the block begins to move move the block slowly with constant force ideal result kinetic friction lab. Honors physics sample lab report conclusion friction lab. Now, its time to include this very real force and see what happens. Lab 05 static and kinetic friction phys 2211l georgia state university perimeter college dunwoody fall 2018 edition pg 2 background ultimately, the source of these contact forces both normal and frictional components originates from the electromagnetic nature of. Kinetic friction is sometimes referred to as sliding friction. When two surfaces are in contact, friction forces oppose relative motion or impending motion.

Kinetic friction definition, types, examples, questions. First you will measure the coefficients of static friction between several combinations of surfaces using a heavy block and a set of hanging masses. Connect the force detector to a block of wood pull gently on the force sensor unit the block begins to move move the block slowly with constant force ideal result kinetic friction lab procedure. In general, static friction is greater than kinetic friction. A simple lab exercise to determine the coefficient of static. Now take two moving solid objects, this is known as moving or kinetic friction. When friction is strong enough to prevent an object from moving, we call it static friction. You will apply a horizontal force to a block of wood loaded with weights in order to pull the block at constant velocity across a horizontal plane. If you apply a light horizontal push that does not move the box, the static friction force is a. Practice finding the acceleration of an object when static and kinetic friction forces are included. The second type is called the coefficient of kinetic friction.

Now, the combination of the force of tension and the force of friction will need to add up such that the block will slide at a constant speed or with zero acceleration. The purpose of this experiment is to study the laws of friction and to determine the coefficient of. The materials used in this lab were a vernier labquest, a wood ramp, at. Theory friction is the force that resists the relative. Kinetic friction once the force applied on a mass exceeds fs,max and the mass begins to move, a kinetic friction force, fk, exists. If you apply a light horizontal push that does not move the box, the. Force of the static and the kinetic friction problems. In this lab, you will measure the coefficients of friction between the. Suggest an experiment that would allow you to find the coefficient of kinetic friction using this new equation. Plot and fit a graph of friction force vs normal force, and write the equation of the fit in the usual way. To measure the coefficients of static and kinetic friction between a wooden block and a wooden plane. We often refer to it as a frictional force yet it doesnt exactly behave as such.

Appendix b logger pro objective to measure and analyze the coecients of friction s and kbetween a wood block and wood plane. Friction block triple beam balance scale 1,000 g mass xplorer force gauge with hook. One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems and is. Static friction is the force that counters your force on the box. The force that has to be overcome in order to get something to move is called static friction. If youre seeing this message, it means were having trouble loading external resources on our website.

Pdf a simple lab exercise to determine the coefficient. In this case, the laboratory exercise may cause confusion rather than enhance concept understanding. In spite of its importance, friction is still not well understood. Static friction is the frictional force acting between two surfaces which are attempting to move, but are not moving. In this activity you will examine how static and kinetic frictional forces vary as the normal force between an object and a surface is changed. Plot and fit a graph of friction force vs normal force. Now take two moving solid objects, this is known as moving or kinetic friction due to its motion. Define and calculate the coefficients of kinetic and static friction, and give the relationship of friction to the normal force. Until now in physics, youve probably been ignoring friction to make things simpler.

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. Use the force sensor to determine how weight affects friction. You will apply a horizontal force to a block of wood loaded with weights in order to pull the block at constant velocity across a. Static friction static friction is friction that occurs when the surfaces in contact are at rest not in motion. 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.

Thus, the static coefficient of friction concerns the force restricting the movement of an object that is stationary on a relatively smooth, hard surface. Use two weights to increase the weight and measure the static and kinetic friction of each surface. Nov 02, 2016 lab setup for static and kinetic friction using vernier force sensor. Friction can thought of as a force that opposes motion. Friction force lab moving after adding additional masses to the dangling mass, it meant we have surpassed the force of static friction and now had kinetic friction. For the coefficient of kinetic friction, you can use the same free body diagram as the one drawn on the first page. In this lab you are given a pulley sensor that can measure acceleration, a force sensor, string, friction. There is a limit to the magnitude of static friction, so eventually you may be able to apply a force larger than the maximum static force, and the box will move. In each run, you will pull the block as before, but by changing the masses on the block, you will vary the normal force on the block. Next, you will measure the coefficient of kinetic friction between two.

Difference between static and kinetic friction pediaa. Lab setup for static and kinetic friction using vernier force sensor. Determine a the maximum force of the static friction. Physics 31210 lab 3 static and kinetic friction introduction. In this lab you will investigate the factors that affect friction. In our static and kinetic friction lab, we were able to see how the weight of an object affects its friction, measure its coefficients, and decipher is.

In this section, you will measure the peak static friction force and the kinetic friction force as a function of the normal force on the block. Friction is everywhere and can be either helpful or wasteful depending on the situation. Difference between static and kinetic friction the graph shows how the frictional force between two surfaces changes as the pulling force is increased. Which friction force will always be greater than the other. We encounter friction at almost all times during the day. Pdf a simple lab exercise to determine the coefficient of static. The maximum static friction force is then, and the normal force is. Static friction force will always be greater than kinetic friction.

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