The Student Room Group

M2 Moments help

Attachment not found

for part a)

If we were to take moments about P, why do we ignore the reaction from the floor to the rod? Solutionbank just ignores it.
Original post by k92e67

for part a)

If we were to take moments about P, why do we ignore the reaction from the floor to the rod? Solutionbank just ignores it.


It's not touching the floor, thus there is no force from the floor.
Original post by k92e67
Attachment not found

for part a)

If we were to take moments about P, why do we ignore the reaction from the floor to the rod? Solutionbank just ignores it.


Original post by RDKGames
It's not touching the floor, thus there is no force from the floor.


I'\ll go further - there is no floor in the question.
Original post by k92e67

thx very much! one last question. in the given scenario when we take moments about X, why do we take the perp distance of a rather than 2a with R but then 2a with F? This is seen with the first line of working by solutionbank


Because perpendicular distances. Clearly the perp. distance to F from X is the red line, which is given by 2asin(θ)2a\sin(\theta) and the perp. distance to R from X is the blue line, which is acos(θ)a\cos(\theta)

(edited 6 years ago)

Quick Reply

Latest