The bottom crate is pulled by a force of 20 N to the right. The μk between the bottom crate and the surface is 0.32. The μk between the bottom crate and the top crate is also 0.32. (Figure 1) (below) Find the acceleration of the 2.0 kg crate.
The bottom crate is pulled by a force of 20 N to the right. The μk between the bottom crate and the surface is 0.32. The μk between the bottom crate and the top crate is also 0.32. (Figure 1) (below) Find the acceleration of the 2.0 kg crate.
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The bottom crate is pulled by a force of 20 N to the right. The μk between the bottom crate and the surface is 0.32. The μk between the bottom crate and the top crate is also 0.32.
(Figure 1) (below)
Find the acceleration of the 2.0 kg crate.
Express your answer to two significant figures and include the appropriate units.
Expert Solution
Step 1
Given data:
- The force acting on the bottom crate is F=20 N.
- The coefficient of friction between bottom crate and the surface is μk=0.32.
- The coefficient of friction between bottom crate and top crate is μk=0.32.
- The mass of the upper crate is m1=1 kg.
- The mass of the bottom crate is m2=2 kg.
The representation of various forces acting on upper crate is shown as,
Step 2
The expression for the tension in the string due to upper crate can be calculated as,
Here, N1 is the normal force of upper crate, and g is the gravitational acceleration having standard value of 9.81 m/s2.
Substitute the known values in the above expression.
The representation of various forces acting on bottom crate is shown as,
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