College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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3. Notice that as soon as the crate begins to move, it starts to accelerate. Can you explain why?
After it starts to move, what is the minimum applied force to keep the crate moving at a constant
velocity?
4. After the crate starts to move, how will increasing of applied force affect friction force on the
crate? Acceleration of the crate? Can you explain why?
5. How does increasing the mass of the crate affect the maximum static friction and kinetic friction
on it?
6. How does increasing the mass of the crate affect the coefficient of static friction and coefficient
of kinetic friction on it? Is the simulation result consistent with the theory of the friction forces
introduced in the class?
Transcribed Image Text:3. Notice that as soon as the crate begins to move, it starts to accelerate. Can you explain why?
After it starts to move, what is the minimum applied force to keep the crate moving at a constant
velocity?
4. After the crate starts to move, how will increasing of applied force affect friction force on the
crate? Acceleration of the crate? Can you explain why?
5. How does increasing the mass of the crate affect the maximum static friction and kinetic friction
on it?
6. How does increasing the mass of the crate affect the coefficient of static friction and coefficient
of kinetic friction on it? Is the simulation result consistent with the theory of the friction forces
introduced in the class?
Transcribed Image Text:aIS8 check the same boxes. Now stack another crate of same mass on top
of the first one. Repeat step 1-3. Record your data in Table 2
friction f-9AN
Table 1
Table 2
Mass of
Maximum static
Kinetic
Mass of
Maximum static
Kinetic
Crate m(kg) friction fs.max (N) friction fr(N)
Crate m(kg) friction fs.max (N) friction fg (N)
50kg
126N
94N
lookg
251N
188N
app ried force: 126N
Analysis: (Question 1-4 is based on data from Table 1, question 5-6 is based data from Table 2.
1. Draw the free body diagram of the crate when it is in motion. Calculate the (static coefficient
of friction) with the information in Data Table 1 fre Mk Xn
30A9.8= 490 N
FN
126
☆ fs= Ms ans Fx= mg
= 0.257
max
50X9.8
fimax
Ms= 0 26
mg
2. Calculate µk (kinetic coefficient of friction) with the information in Data Table 1:
fx= Mk X n
Mk = 0-19
94 = MKX 50x 98
%3D
KTnetic Coelficent 94
= 0.192 o. 19
of forction.
50x9.8
2
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