Question

Two wooden crates rest on top of one another. The smaller top
crate has a mass of m_{1} = 15 kg and the larger bottom
crate has a mass of m_{2} = 88 kg. There is NO friction
between the crate and the floor, but the coefficient of static
friction between the two crates is μ_{s} = 0.85 and the
coefficient of kinetic friction between the two crates is
μ_{k} = 0.66. A massless rope is attached to the lower
crate to pull it horizontally to the right (which should be
considered the positive direction for this problem).

What is the maximum tension that the lower crate can be pulled at before the upper crate begins to slide?

4)

The tension is increased in the rope to 1202 N causing the boxes to accelerate faster and the top box to begin sliding. What is the acceleration of the upper crate?

As the upper crate slides, what is the acceleration of the lower crate?

Answer #1

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a hanging crate of mass m2 = 16.3 kg. The crates move 1.4 m,
starting from rest.
Find the work done by gravity on the sliding crate.
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A 17.6-kg crate starts at rest at the top of a 60.0° incline.
The coefficients of friction are μs = 0.400 and
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a) How long does it take the crate to slide 2.00 m down the
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μs=0.45μs=0.45.
What is the maximum horizontal force that can be applied to the
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3. Two blocks of mass m and M = 10.0 ks are connected via a
massless and frictionless pully with a configuration as shown. The
coefficient of static friction is μs = 0.7 between block and
surface, while the coefficient of kinematic fraction is μk =
0.4.
1) Draw free-body diagram for both block (identify all the
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2) What is the maximum mass m for the hanging block so that no
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3) If...

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A box rests on top of a flat bed truck. The box has a mass of m
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1)The truck accelerates from rest to vf = 17 m/s in t
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QUESTION 15
A wooden crate with a mass of 136 kg sits on the ground. The
coefficients of friction between the ground and the crate are 0.85
and 0.45. One person pushes the crate to the right with a force of
1200 N and another pushes the crate to the left with a force of
2500 N.
What is the acceleration of the crate?
5.15 m/s2 to the left
1.23 m/s2 to the left
0.0 m/s2 or it doesn't move...

A crate with a mass of 3.00 kg starts from rest at the top of a
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(a) What is the magnitude of the acceleration of the crate (in
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2.56 m/s2 correct
b) What is the frictional force (in N) acting on the crate?
(Enter the magnitude.)
(c) What is the coefficient of kinetic friction between the
crate and the incline?
(d) What is the speed of the...

Two packing crates of masses
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and
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A. What is the acceleration of the 2.0 kg block?

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