The Effect Of Friction On The Coefficient Of Friction

5. Record the effort force shown on the Newton Scale in newtons while pulling the cart up the inclined plane.

Locate the force string and use the hooked end to connect the force string to the other side of the spinning mass. Guide the force string over the pulley. Suspend the mass hanger plus an additional 0.55 kg of mass, so that m= 0.6 kg. Ensure that the weight hanger does not touch the table top. This hanging mass will be referred to as the force mass from now on, and is used to set the centripetal force, Fc. The force Fc is equal to the force mass, in kg, multiplied by gravity. Calculate this value and record it onto Data Sheet C. Adjust the tension knob so that the tip of the spinning mass is directly above the

The purpose of this experiment was to investigate the effects of different masses hoisted by an electric motor from ground level to a height of 1.29 m. The main purpose was to look how a change in mass affected the efficiency of our motor, but it did affect other variables such as power, current, force, etc. For this experiment, our hypnosis is that as mass increases, the efficiency increases. Because in the equation for efficiency, efficiency=gain in potential differenceelectrical energy used, gain in potential difference = mgh, the mass of an object has a direct relationship with the efficiency of the motor. In this equation, we see that efficiency is affected by the mass that is lifted, gravity, the height the mass is being lifted, and the amount of energy that is put into the system. We can see that mass, gravity, and height has a direct relationship while inputted power has an inverse relationship with efficiency.

In friction piles the load is resisted by friction between the surface of the pile and the surrounding soil. A pure friction pile is usually quite long due to the fact that the load carrying capacity is a function of the shaft being in contact with the soil.

The diagram below shows the forces acting on a block of weight     it slides down a slope.

The purpose of this experiment was to investigate the kinetic and static friction coefficient of a friction forces acting on a wooden block by increasing the mass in each experiment. Each experiment was attempted to find the relationship between the friction force and the normal forces on the wooden block as it being slid horizontally maintaining a uniform motion by a spring scale. Every experiment was documented and finally, with the help of computer-generated graph it was understood that the Friction force and the Normal force were relative to each other. The friction coefficient was calculated to be s=0.389 and the kinetic friction coefficient was k=0.323.

The two different types of friction that affected the performance of our vehicle was the concrete floor and the elastic band winded around the axel. We first used the elastic band connected with string but we changed it after not the first test.

What did you notice about the input needed to balance the lever when you increase the length of the effort arm (distance between input force and fulcrum)?

When a chemical reaction happens atoms are rearranged and new chemical substances are formed. In a chemical reaction there are changes of energy often in the form of heat. Gases expand to fill any space that is available, however a gas is easier to see when it’s a bubble. Mixing baking soda and vinegar together will create a whole bunch of bubbles at once. Baking soda is made from the deposits of white water soluble solid in powder,however it is pulled out by a water process that uses no chemicals. Vinegar is a liquid including mainly of acetic acid and water. The amount of friction between objects depends on how hard objects, push against each other. Friction is the force that slows objects down when they rub together.

One day in the city of Frictiontopia, Mr. Friction was once again saving the day from the city’s wicked criminals. He could control the friction of any object at any time. He would cause massive amounts of friction to criminal’s getaway cars which causes them to stop immediately and burst into flames because of the high amounts of friction. He could also lessen friction to cause criminals to lose their balance. Mr. Friction never got sick because of his very robust immune system. If Mr. Friction were to get sick, all friction in Frictiontopia would cease to exist and the city would enter into a state of chaos. That night (in January), during a speech, Mr. Friction began to cough, sneeze and lose his voice. The crowd thought nothing of it and

The force of friction can be increase by choosing having a rougher surface to pull the object across. The surface used in this lab was a table so it was very smooth and the objects glided when pulled. A rougher surface like sand or dirt would increase the amount of friction produced. Friction, static or dynamic is the normal force between the surfaces multiplied by the coefficient of friction. But another way to think of it is that friction is a function of the pressure between the two surfaces (force per unit area), multiplied by coefficient of friction, multiplied by the contact area.

As a result of trail and error method we find the angle for the third pulley and the mass that should had be suspended from it. This will balance the forces deployed on the strings due to the other two masses. While the third force is defined as the equilibrant (������⃗������) Since it is the force that establishes the equilibrium. It is also the negative of the resultant -������⃗������ = ������⃗������ = ������⃗ ������ + ������⃗������. We gathered and recorded the mass and the angle required for the third pulley to enable to put the system into the equilibrium in table 1.

From analyzing the students’ choices of models of friction and lubrication, two overarching themes emerged regarding mechanical and chemical interactions. We see in table III that about 81% of the students interviewed used mechanical interactions to explain friction and when asked to explain microscopic friction the majority referred to their “interlocking-intertwining” or “rubbing-hitting” models. Most agreed friction is the force required to move atoms over bumps and valleys because of intertwining and interlocking of the atoms or friction is the force caused by the rubbing and sliding of an atom past another. Also when the students with the interlocking model were question about the outcome if the surface was to become automatically smooth they all agreed friction would persist because “there is still some contour in the them (atoms).” Likewise when asked to explain why oil reduces friction, the majority said the “oil molecules roll” like a “ball bearings rolling on a surface”. The theme that the thematic analysis revealed about the chemical interactions was that around 27% of the students think that microscopic friction is the force needed to break the bonds required to break bonds between the atoms of the surfaces that are touching. When that 27% of the students was asked to explain why kinetic friction is less than static friction, 66% of them thought there is less bonds once the surface is in motion because “they (the atoms) might not have enough time to form that

The premise behind this experiments revolves around the force and coefficients of friction. Static friction is the force that prevents a stationary object from moving. The direction of static friction is opposite to applied force. Kinetic friction is the force that acts against an object’s motion. The direction of kinetic friction is opposite to the object’s velocity. Frictional forces act parallel to the surfaces they act upon. The coefficient of kinetic and static friction both show the magnitude. Between the forces and the materials, the coefficient represents a ratio between normal force and the force of friction.

Static friction was where the tilt of the stainless steel plane slowly increased till the tray started to slide. The angle at which the tray started to accelerate was then recorded. This activity was repeated three times for each of the four specimens. The average of the three obtained values was calculated.