SUMMARY OF FRICTION The maximum force of static friction that exists between two surfaces is proportional to the normal force and mostly independent of area of contact. This situation is shown here: N = the total normal force (force perpendicular to the horizontal surface) which is essentially the weight of the object. The coefficient in that equation is called the coeffecient of static friction and that depends on the material: When the object is actually moving‚ the friction is said to be kinetic
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the revolution and rotation of the ball mill grinding media along the axis of the cylinder in the cylinder body‚ between the grinding media and its contact with the cylinder area produce squeezing and grinding the peel force‚ ore and ore milled. Friction between the ball mill ball and cylinder when the cylinder rotates‚ the ball is brought up and rise to a certain height‚ the ball itself‚ gravity‚ and finally along the whereabouts of a certain orbit. ball mill:http://www.china-xingbang.com/
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[5.5cm radius] - CD (2) [6cm radius] - Thin stick - Pulley - Tape 2. The shoebox and the poles were measured and marked at places for drilling. 3. Four holes were drilled on the shoebox with electric drill. (Larger than the axles to reduce friction from the cardboard on the axles) 4. A hole was drilled near the top of each pole. 5. The box was cut on the two sides and the poles were inserted and taped onto the cart. 6. The string was wrapped around the back axle. 7. A CD was attached on
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Lab 106 Static and Kinetic Frictions Objectives: Our objectives are to measure the static and kinetic frictional forces using force sensors. Also‚ to determine the coefficient of static and kinetic frictional forces‚ amd the relationship between the frictional forces. Background/Sketch: **attached** Data Analysis: Cart= 82.45g Normal (N) Static (N) Kinetic(N) 100g 1.78 0.63 0.477 200g 2.76 0.83 0.716 300g 3.74 1.19 1.163 400g 4.72 1.67 1.520 500g 5.71 1.79 1.699 600g 6.69 1.88 1.670 1.00kg
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Physics Experiment 105 FRICTION Name: Alviar‚ Renée Hannah C. Program/ Year: AR – I Course Code/ Section: PHY10-2L – A2 Student No.: 2012170402 Group No.: 5 Date of Performance: February 18‚ 2013 Date of Submission: March 4‚ 2013 Instructor: Prof. Morris Martin M. Jaballas GRADE: DISCUSSION During Part A (Determination of the Coefficient of Friction) of this experiment‚ as we determine Wb and Wp‚ we are then able to calculate for the coefficient of friction (µ) using the formula:
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motion. This relationship can be viewed in the formula: Force = mass (acceleration) The key to keeping the mousetrap car accelerating is to keep the forces acting upon it unbalanced. The force of the mousetrap car has to be larger than the force of friction working against the car. Because the force provided by the mousetrap is rather minuscule‚ and the force needs to strong enough to move the mousetrap car‚ we are faced with our next obstacle. We have to make the mass of the object light enough to
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all choices before answering. face of the table? Assume the boxes each have masses of 2.0 kg‚ the coefficient of static friction is µs between table and box‚ and the acceleration due to gravity is 10 m/s2 . 001 10.0 points A block accelerates 3 m/s2 down a plane inclined at angle 27.0◦. The acceleration of gravity is 9.81 m/s2 . 1. The force of the static friction would have a vertical component in this situation‚ and that is impossible since it must be parallel to the table surface
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1.6 kJ 2. A horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed‚ find (a) the work done by the 150-N force and (b) the coefficient of kinetic friction between the crate and surface. 900J‚ 0.383 3. A block of mass 2.50 kg is pushed 2.20 m along a frictionless horizontal table by a constant 16.0-N force directed 25.0° below the horizontal. Determine the work done by (a) the applied force‚ (b) the
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1) Block B in Fig. 6-31 weighs 603 N. The coefficient of static friction between block and table is 0.32; angle θ is 33°; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary. Fig. 6-31 A)150 N B)175 N C)125 N D)200 N 2) In Fig. 6-33‚ two blocks are connected over a pulley. The mass of block A is 7.8 kg and the coefficient of kinetic friction between A and the incline is 0.13. Angle θ of the incline is 44°
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The Physics of Braking Systems By James Walker‚ Jr. of scR motorsports Copyright © 2005 StopTech LLC Author’s disclaimer: mechanical systems operating in the physical world are neither 100% efficient nor are they capable of instantaneous changes in state. Consequently‚ the equations and relationships presented herein are approximations of these braking system components as best as we understand their mechanizations and physical attributes. Where appropriate‚ several examples of limiting conditions
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