Answer to Question #148782 in Mechanics | Relativity for althea alcorin

Question

A wooden crate is at rest on a level stone floor. A. What is the minimum horizontal force needed to start the crate moving? B. What is minimum horizontal force needed to keep the crate in motion at constant speed. C. what will happen if a horizontal force of 500 N is applied to the crate? µs = 0.5 µk = 0.4

Answer 1

let the mass of the crate be $m$

A) $F_{min} = \mu_{s} mg = 0.5\times m \times9.8 = 4.9m (N)$

B) $F_{min} = \mu_{k}mg = 0.4\times m \times9.8 = 3.93m (N)$

C) The acceleration of the crate will increase.