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**1. The problem statement, all varia**

**bles and given/known data**2 crates, 75kg(crate x) and 110kg(crate z) are in contact and at rest on a horizontal surface. A 620N force is applied on crate x . If the coefficient of friction is 0.15, calculate:

a.) the acceleration of the system

b.)the force that each crate exerts on each other

c.) repeat when the crates reversed

2. Homework Equations

2. Homework Equations

Msys = (mass

_{x})+(mass

_{z})

Force = mass(acceleration)

## The Attempt at a Solution

a. Msys = 75kg + 110kg

= 185kg

620N = 185kg(a)

a = 3.35m/s

^{2}

b.

cratex= 75kg(3.35m/s

^{2})

=251.25N

cratez= 110(3.35m/s

^{2})

=368.5N

c.

cratez= 110(3.35m/s

^{2})

=368.5N

cratex= 75kg(3.35m/s

^{2})

=251.25N

thanks in advance!