- For \( m_1 \) (1.5 kg crate on the incline):
- Gravitational force: \( F_{\text{gravity},1} = m_1 \cdot g = 1.5 \cdot 10 = 15 \, \text{N} \)
- Normal force: \( F_{\text{normal}} \)
- Frictional force: \( F_{\text{friction}} = \mu \cdot F_{\text{normal}}
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