Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall (Fig) . The coefficient of friction between the bodies and the table is `0.15` . A force of 200 N is applied horizontally to A . What are (a) the reaction of the partition (b) the action -reaction forces between A and B ? What happens when the wall is removed ? Does the answer to (b) change , when the bodies are in motion ? Ignore the difference are in motion ? Ignore the difference between `mu_(s) and mu_(k)`

Explanation

Here , mass of body `A_(1)m_(1) = 5 kg `
Mass of body `B_(1)m_(2) = 10 kg `

Coefficientof friction between the bodies and the table `mu= 0.15`
Horizontal force applied on A .
F = 200 N
(a) Force of limitating friction acting to the left
`f = mu(m_(1)+m_(2))g`
`= 0.15 (5+10) xx 9.8 = 22.05 N `
` :. ` Net force to the right exerted on the partition
F = `200 - 22.05 = 177.95 N `
Reaction of aprtition = `177.95` N to the left .