Lab Report #3
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Dec 6, 2023
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LAB EXERCISE 3
Kennedy 1
Lab Exercise 3: Friction
Kaylyn A. Kennedy
Thomas Edison State University
PHY-1280-OL009
Professor Robert Hill
September 17, 2023
LAB EXERCISE 3
Kennedy 2
Lab Exercise 3: Fcceleration
1.
Introduction
The purpose of this lab is to investigate the relationship between static and kinetic friction forces.
Friction is a force that opposes the relative motion of two objects. It is caused by the relative
roughness of the surfaces of the objects. The outcome of this experiment should show a
real-world example of these friction forces at work, proving that it takes more force to start an
object’s movement than to keep it moving.
2.
Methods
A.
Preparation and Setup
○
Each iteration of the trial was performed with a different surface combination:
Table 1 was performed with the large side of the wood only block, Table 2 was
performed with the small edge of the wood only block, Table 3 with the glass side
of the wood/glass/sandpaper block, and Table 4 with the sandpaper side of the
wood/glass/sandpaper block. All iterations were performed on a flat, finished
wooden table top with a standard 12 fl. oz can on top of the blocks. Each block
was pulled by a spring scale to get force measurements, taken in Newtons(N).
Photos below of each setup:
Figures:
Figure 1: Wood only block, on large side.
Figure 2: Wood only block, on small side
LAB EXERCISE 3
Kennedy 3
Methods(cont.)
Figure 3: Wood/glass/sandpaper block, on
glass side
Figure 4: Wood/glass/sandpaper block, on
sandpaper side
B. Static and Kinetic Friction Measurement
○
These measurements were performed by pulling each apparatus five times and
marking the force required to begin movement. Then, the action was repeated five
times and force was marked when the object reached a constant speed. Results for
these experiments are recorded in the tables below.
3.
Data
-All Forces represented are in Newtons
-Mass of Block/Can apparatus in Tables 1 and 2 equal 403.1g therefore, F
N
=mass(kg)*9.8m/s
Tables 1 and 2: F
N
= 3.95 N
-Mass of Block/Can apparatus in Tables 3 and 4 equal 432.8g therefore, F
N
=mass(kg)*9.8m/s
Tables 3 and 4: F
N
= 4.24 N
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Related Questions
PHYS X PHYS X
印 PHYS X
PHYS X
POTPHYS X
PHYS X
E PHYS X E PHYS
top/semester2/physics%20for%20engineers/PHYS220_CH15_Lecture%20Notes_Problems%2015 19,15.29 S
(D Page view
A Read aloud
V Draw
Problem-15-19: page-475
A 0.500-kg object attached to a spring with a force constant of 8.00 N/m vibrates in simple harmonic motion
with an amplitude of 10.0 cm. Calculate the maximum value of its
(a) speed, and acceleration.
(b) the speed and the acceleration when the object is 6.00 em from the equilibrium position, and
(c) the time interval required for the object to move from.r50 to r5 8.O0 cm.
Solution:
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C
Dynamic Analysis and Aeroelasticity
SECTION B
Answer TWO questions from this section
ENG2012-N
The moment of inertia of a helicopter's rotor is 320kg. m². The rotor starts from rest
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T = 250t.
a) How long does it take the rotor to turn ten revolutions?
b) What is the rotor's angular velocity (in RPM) when it has turned ten
revolutions?
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Please asap
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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,
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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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you pull to keep it moving with constant velocity? Assume that
H = 0.40.
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wax has worn off, so there is now a nonzero coefficient of kinetic
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Model
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Hull Wetted Surface Area (ft2)
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Figure
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• View Available Hint(s)
Figure
1 of 1>
F =
Value
Units
Submit
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Suppose that the tires are capable of exerting a maximum friction force
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> View Available…
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