Theory 101 Chapter 4 Newton's Laws of Motion

Attribution: OpenStax, University Physics Volume 1, access for free at
https://openstax.org/details/books/university-physics-volume-1

Assessment

variable	quantity	SI unit
\( N \)	Normal force which is equal to the weight, \( N=mg \).	\( N \)
\( P \)	Push on the crate directed to the right. If \( P=120 N \), friction is static friction. The crate is at rest. If \( P=180 N \), friction is kinetic friction. Crate is moving.	\( N \)
\( \mu_{s} \) \( \mu_{k}\)	coefficient of static friction coefficient of kinetic friction	no unit
\( f_{s}(max)=\mu_{s} N \) \( \quad =\mu_{s} mg \) \( f_{k}=\mu_{k} N \) \(\quad=\mu_{k} mg \quad \)	maximum static friction kinetic friction Friction is proportional to normal force.	\( N \)
\( F_{net}=P-f_{k} \)	Net horizontal force on the crate. This net force creates acceleration.	\( N \)

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