Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Textbook Question
Chapter 7A, Problem 5PLA
For the laboratory measurement of the static coefficient of friction the maximum value of the force measured by the force sensor is taken to be the value of fs the frictional force. Describe why the maximum value of the force is the correct measurement.
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Students have asked these similar questions
Friction
Be able to calculate, for both kinetic and static friction:
a. The frictional force, given the mass and coefficient of friction,
including experimental uncertainty.
b. The coefficient of friction, given the mass and frictional force,
including experimental uncertainty.
c. The mass or the normal force, given the friction coefficient and
the applied frictional force, including experimental uncertainty.
Be able to sketch a force diagram for a block either at rest or sliding, with
friction.
Example 1:
A block of wood with a mass of 220 g (assumed exact) is sitting on a
surface, where the coefficients of static and kinetic friction between the
materials are μ = 0.31±0.01, Mk = 0.22 +0.01.
What force is required to get the block moving? Quote your answer
including an experimental uncertainty. (0.67N ± 0.02N)
Once the block is moving, what horizontal force is required to keep the
block sliding at constant speed? Quote your answer including an
experimental uncertainty. (0.47N ± 0.02N)…
One day, you are driving your car down the highway, and you notice that you are driving well over the speed limit. You apply the brakes of the carapplying a variable stopping force, until the car slows down to a rea sonable speed of 22.4 m/s (50 mph)A computer plots the force versus time for the vehicle and then measures the area under the curve. It is found that the area is - 18.950N . The total breaking time was 5.4 s. Given that the combined mass of you and your car 1sm = 1200 kg how fast were you moving before applying the breaks? What is the average force applied by the road to the car during breaking? (Note: 1Ns=1kg* m/s)
For what value M of the clockwise couple will the horizontal component Ax of the pin reaction at A be zero? If a couple of that same
magnitude Mwere applied in a counterclockwise direction, what would be the value of A,?
2.6-
2.6
1.5'
A
B
125 lb
1.5'
.
59
C
Answers:
M =
i
Ib-ft
Ax =
Ib
Chapter 7A Solutions
Physics Laboratory Manual
Ch. 7A - Prob. 1PLACh. 7A - Static friction is (a) always less than the...Ch. 7A - The two coefficients of friction discussed in this...Ch. 7A - Suppose a block of mass 25.0 kg rests on a...Ch. 7A - For the laboratory measurement of the static...Ch. 7A - Prob. 6PLACh. 7A - Prob. 7PLACh. 7A - For either type of coefficient of friction, what...
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- Suppose a team has data that is always systematically higher than the model. They explain that the in other words, the theoretical model doesn't assumption of negligible friction may be the cause account for the friction present in the experimental set-up, and this is the cause of the difference. Explain why this cannot be the case. -arrow_forwardThe man push a 90 kg mass. gradually until the box begins to move Note the value of the maximum static friction exerted by the floor and compute the experimental value of the coefficient of static friction of the floor.arrow_forwardThe coefficient of kinetic friction is in the direction of the frictional force O is in the direction of the normal force O is the ration of force to area O none of the abovearrow_forward
- A scanning electron micrograph of xylem vessels in a corn root shows the vessels magnified by a factor of 608. In the micrograph the xylem vessel is 5.60 cm in diameter. What is the diameter of the vessel itself, answer in cm? and By what factor has the cross-sectional area of the vessel been increased in the micrograph?arrow_forwardThe following table shows measurements for fiberlengths and fleece weight in a small flock of eight sheep. Sheep Fiber Length (cm) Fleece Weight (kg)1 9.7 7.92 5.6 4.5 3 10.7 8.34 6.8 5.45 11.0 9.16 4.5 4.97 7.4 6.08 5.9 5. What is the correlation coefficient for fiber lengthand fleece weight?arrow_forwardIn a lab activity, forces A and B were set on the force table. A = 0.10 N at 0 degrees and B = 0.10 N at 90 degrees. A third force of 0.15 N at 225 degrees balanced forces A and B. What is the experimental magnitude of the resultant of forces A and B ? А) 0.10 N 0.14 N 0.15 N zeroarrow_forward
- = A vehicle travels with a speed of 80 km per h, with a drag coefficient of 0.25. If the cross-sectional area is 6 square meters, then find out the drag force.arrow_forwardBy using dimensional analysis, identify two non-dimensionnumbers in which the drag coefficient is a function of them and explain how these two will effect on drag coefficient.arrow_forwardIn a lab activity, forces A and B were set on the force table. A = 0.10 N at 0 degrees and B = 0.10 N at 90 degrees. A third force of 0.15 N at 225 degrees balanced forces A and B. What is the experimental magnitude of the resultant of forces A and B? A) zero 0.14 N C) 0.10 N D) 0.15 Narrow_forward
- A scanning electron micrograph of xylem vessels in a corn root shows the vessels magnified by a factor of 613. In the micrograph the xylem vessel is 2.80 cm in diameter. a. What is the diameter of the vessel itself? answer in cm b. By what factor has the cross-sectional area of the vessel been increased in the micrograph?arrow_forwardUsing the Hamwi method, calculate the Ideal Body Weight (IBW) of a man who is 6 ft tall and is of medium frame Calculate the BMI for an individual who is 5 ft 5 inches and weighs 145 lbsarrow_forwardA rod of length 24.00 cm has linear density (mass per length) given by λ - = 50.0 + 24.5x where x is the distance from one end, and is measured in grams/meter. (a) What is its mass? X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. g (b) How far from the x = 0 end is its center of mass? m Need Help? Read Itarrow_forward
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