LAB REPORT 3
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Dean Taylor 6/7/23 PHY 133 L69 TA: Chamathka Thotamuna Wijewardhana The Force of Friction
Introduction: The force of friction is one that moves opposite to sliding motion. The goal of this lab report is to measure how friction changes with mass and to draw conclusions from collected data. While there are two key types of friction (static and kinetic), this lab will focus only on determining kinetic friction by an increasing mass of the IO Device and determining the coefficient of kinetic friction for a given surface. Prior to the movement of an object, static friction is in effect. If an object is in movement the force due to friction is described as being kinetic. The IO Device will be used to determine varying masses and accelerations with a given mass in order to solve for a coefficient of friction. It is expected that as mass increases, force of friction increases as well while the coefficient of kinetic friction should not change. The following equations will be used to make this determination: ࠵? = ࠵?࠵?
࠵?
!
= ࠵?࠵?
Procedure: Determination of Mass: 1.
Ensure the USB is plugged in and the IO Device is powered on 2.
Use the screw attachment on the force sensor 3.
Place the IO Device such that the y-axis points towards the floor 4.
Press record, wait 1 second, and lift the device by the screw (hold in place for a couple seconds) 5.
Place the device down and press stop 6.
Use the analysis tool to record mean acceleration prior to the lift as well as mean force during the lift 7.
Use the formulas above to solve for the mass Finding Deceleration and Force Due to Friction 1.
Ensure the USB is plugged in and the IO Device is powered on 2.
Attach the plate attachment to the force sensor 3.
Place the IO Device on face up (such that the “IO Lab” label faces the ceiling) 4.
Press record and push the device from the plate in the “y-direction” 5.
After the graph returns to its original values, press stop. 6.
Use analysis mode to find the acceleration just after the applied force 7.
Note this figure and use the equations found above in conjunction with the calculated masses to find force due to friction Measurements for Varying Masses 1.
Tape a mass (such as a phone or lighter) to the wheel (or “IO Lab”) side of the IO Device 2.
Follow instructions given in both sections above to determine new mass as well as new acceleration 3.
Tape an additional mass to the IO Device (ensure you leave the originally added mass to the device) 4.
Perform the experiment, again, using procedures above 5.
Compile all data accordingly and calculate necessary values using the F=ma equation Results: Test # Average Fg Sigma Value for Fg Average g Sigma Value for g 1 -1.687 N 0.0032 N -9.818 m/s^2 0.013 m/s^2 2 -2.100 N 0.0047 N -9.816 m/s^2 0.014 m/s^2 3 -2.662 N 0.0039 N -9.820 m/s^2 0.013 m/s^2 Figure 1: All Data for all Values Used for Mass Determination
Figure 2a: Acceleration and Force (due to gravity) vs. time graph (at rest on surface) for Test 1 Figure 2b: Acceleration and Force (due to gravity) vs. time graph (being held from screw) for Test 1
Figure 3a: Acceleration and Force (due to gravity) vs. time graph (at rest on surface) for Test 2 Figure 3b: Acceleration and Force (due to gravity) vs. time graph (being held from screw) for Test 2
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February 7,
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H.W MECHANICS PHrsics
Example 5.13 Friction in horizontal motion
You want to move a 500-N crate across a level floor. To start the
crate moving, you have to pull with a 230-N horizontal force.
Once the crate "breaks loose" and starts to move, you can keep it
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Example 5.15 Minimizing kinetic friction
In Example 5.13, suppose you move the crate by pulling upward
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F(t)
Force_Crate
Known values:
Mass of Block
68 kg
TT
Hs μk
0
0.63 0.53 26°
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A crate is initially at rest on a sloped surface, when a force is applied: F(t)
where t is in seconds.
Answers:
When t=44.47 seconds, the crate has not yet started moving.
Find the magnitude of the friction force at that time:
317.771 N
The direction of the friction force at that time is: down the slope
Find the time required for the crate to start moving:
Find the crate's speed when t=174.9 s: 9.485 m/s
Be sure to include units with your answers.
169.756 S
240+0.2 N,
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4
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PHYS X PHYS X
印 PHYS X
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POTPHYS X
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top/semester2/physics%20for%20engineers/PHYS220_CH15_Lecture%20Notes_Problems%2015 19,15.29 S
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Problem-15-19: page-475
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IMG 20210429 11...7.jpg
...
For conservative system:
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Page 4 of 7
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Part I: Taking Measurements & Estimating Uncertainties for a single measurement
www.stefanelli.eng.br
The mass of the object is_
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Parts on a tripie peam palance
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10 20 30
1
100
2 3
40
200
4
+/-
50 60 70
5
300
7
400
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Qv Search
8
90
9
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9
10 g
www.stefanelli.eng.br
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791²
(1)
Calculate:
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analysis (the inputs are g and vo and the output is the time of landing. Think about
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(c) The times at which the ball reaches the height v/(2g). You should find that both
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(d) The times at which the ball reaches the height v/g. What is the physical interpretation
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• Stroke
• Speed
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= 10 cm
= 14 cm
= 2500 rpm
= 480 N
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= 3.3 cm
= 0.62
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i.
The volumetric efficiency
The brake mean effective pressure ( b.m.e.p)
The engine torque
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ii.
iv.
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Problem 4.137
3 of 4
Syllabus
I Review
Scores
Replace the three forces acting on the plate by a wrench. Suppose
that FA = {450i}N, FB = {-350k} N, and Fc = {300j} N.
(Figure 1)
Part B
eТext
Determine the couple moment of the wrench.
Express your answer to three significant figures and include the appropriate units. Enter positive value if the sense of direction of the couple moment is the
same as that of the resultant force and negative value if the sense of direction of the couple moment is opposite to that of the resultant force.
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Related Questions
- 1 The following observations are recorded during a test on a four-stroke petro engine, F.C = 25cc of fuel in 10 sec, speed of the engine is 2600 rpm, B.P = 22 kW, Qair 0.00134 m, piston diameter 90 mm, density of the fuel = 0.85gm/cc , compression ratio = 7.5, CV of fuel = 42000KJ/Kg, room temperature = 24 °C %3D = 140mm, stroke length = %3D %3D %3D 2 A six-cylinder 4-stroke cycle petrol engine is to be designed to develop 250 kW of (b.p) at 2200 rpm the stroke / bore ratio is to be 1.3:1. Assuming nm =80% and an indicated mean effective pressure of 9.5 bar, determine the required bore and stroke. If the compression ratio of the engine is to be 7.5 to 1, determine consumption of petrol in kg/h and in kg/bp.hr. Take the ratio of the indicated thermal efficiency of the engine to that of the constant volume air standard cycle as 0.65 and the calorific value of the petrol as; 44770KJ/kg.arrow_forwardCASIO fx-991ES PLUS ALPHA CALC EGO the car move ? [Ans. NA 16.5 kN, Ng =42.3 kN, the car does not move] %3D 5. A box weighs 150 kg. The coefficient of static friction between the box and the ground is 0.3. Determine if the 80 kg man can pull the box without slipping when the coefficient of static friction between the man's shoes and the ground is 0.4. Hint: analyse block and man separately i.e. draw separate FBDSarrow_forwardFebruary 7, 2021 H.W MECHANICS PHrsics Example 5.13 Friction in horizontal motion You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction? Example 5.15 Minimizing kinetic friction In Example 5.13, suppose you move the crate by pulling upward on the rope at an angle of 30 above the horizontal. How hard must you pull to keep it moving with constant velocity? Assume that H = 0.40. Example 5.16 Toboggan ride with friction I Let's go back to the toboggan we studied in Example 5.10. The wax has worn off, so there is now a nonzero coefficient of kinetic friction 4. The slope has just the right angle to make the toboggan slide with constant velocity. Find this angle in terms of w and Hg. Example 5.17 Toboggan ride with friction II The same toboggan with…arrow_forward
- F(t) Force_Crate Known values: Mass of Block 68 kg TT Hs μk 0 0.63 0.53 26° Problem Statement: A crate is initially at rest on a sloped surface, when a force is applied: F(t) where t is in seconds. Answers: When t=44.47 seconds, the crate has not yet started moving. Find the magnitude of the friction force at that time: 317.771 N The direction of the friction force at that time is: down the slope Find the time required for the crate to start moving: Find the crate's speed when t=174.9 s: 9.485 m/s Be sure to include units with your answers. 169.756 S 240+0.2 N,arrow_forward62. •A 5-kg object is constrained to move along a straight line. Its initial speed is 12 m/s in one direction, and its final speed is 8 m/s in the opposite Complete the graph of force versus time with direction. F (N) (s) appropriate values for both variables (Figure 7-26). Several answers are correct, just be sure that your answer is internally consistent. Figure 7-26 Problem 62arrow_forwardProblem Solving: )An object falls from rest in a medium offering a resistonce. The velocity of the object hefore the ohject reaches the ground is given by the differential egua- tion dv/t + V% = 32, t/sec. uhat is the veloaty of the okject one second after it falls ?arrow_forward
- The "spring-like effect" in a golf club could be determined by measuring the coeffi cient of restitution (the ratio of the outbound velocity to the inbound velocity of a golf ball fired at the clubhead). Twelve randomly selected drivers produced by two clubmakers are tested and the coefficient of restitution measured. The data follow: Club 1: 0.8406, 0.8104, 0.8234, 0.8198, 0.8235, 0.8562, 0.8123, 0.7976, 0.8184, 0.8265, 0.7773, 0.7871 Club 2: 0.8305, 0.7905, 0.8352, 0.8380, 0.8145, 0.8465, 0.8244, 0.8014, 0.8309, 0.8405, 0.8256, 0.8476 Test the hypothesis that both brands of ball have equal mean overall distance. Use a = 0.05 and assume equal variances. Answer the following questions regarding the t-test. 1. How many degrees-of-freedom are there in this problem (needed for finding the critical t- values). 2. What is the absolute values of the critical t-value for this problem? We are using a two- tailed t-test with a significance level of 5%. (use four significant figures) 3. What is…arrow_forwardGiven: The plane accelerates in its current trajectory with a= 100 m/s^2 Farag Angle theta= 5° W=105 kips F_drag= 80 kips m= 1000 lbs Find: F_thrust, F_lift Please include the KD. Fthrust Futel t Fueight 000 BY NC SA 2013 Michael Swanbomarrow_forwardPIoVide ue comect u We want to design an experiment to measure oscillations of a simple pendulum on the surface of Jupiter with acceleration due to gravity g= 30 ms 2. We have to make do with a rudimentary video camera with a frame rate of 15 Hz to record oscillations in a pendulum and use it to measure the frequency of oscillation. The smallest length of the pendulum that we can send so that the correct oscillation frequency can be measured is cm. Assume perfect spatial resolution of the camera and ignore other "minor" logistical difficulties with this experiment.arrow_forward
- A model pump has an impeller diameter of 30 cm. During a manufacturer's test, this model achieved an efficiency of 80%. A prototype in the same family (geometrically similar) is 10 times larger than this tested model. Under the same operating conditions dynamically similar to those in the model test, what most approximately will be the efficiency of the prototype pump? O 74% OOOO O 64% O 84% O 94%arrow_forwardA physics lab consists of a large ball attached to a wire. Students hold on to one end of the wire, then whirl the ball around in circles and count the number of rotations per second. One group finds these numbers: ball mass= 320 gram, wire length= 1.3m, number of rotations/sec=2.5. The wire is made of steel with a diameter of 1mm and a Young's modulus of 20x10^10 N/m^2.How much does the wire stretch due to the tension on it? Should the students correct their data for the wire stretching?arrow_forwardIn a vehicle safety test, two vehicles are crashed into one another and a force sensor on one of the vehicles records the following curve for the force that it experienced as a function of time. Add to this graph a sketch of the force that the other car experienced as a function of time and use these two curves to explain why momentum is conserved in all types of collisions. Force (N) (0,0) Time (s)arrow_forward
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