Physics question moments

Hi, please could i have help on this question? The answer is A
Here is the question: https://app.gemoo.com/share/image-annotation/632112069878550528?codeId=P575jnX8X0Nl9&origin=imageurlgenerator
Thanks!!

Reply 1

mosaurlodon

Its about moments so

take the pivot to be at point P
Q makes a upward force and Weight makes a downward force
as the person walks from R to Q perpendicular distance decreases with same weight, so moment caused by person decreases, and so moment caused by Q decreases, and since the perpendicular distance from pivot P to Q is the same, this means force at Q decreases.

Same concept if you take pivot at Q
P makes a downward force and Weight makes a downward force
as the person walks from R to Q perpendicular distance decreases with same weight, so moment caused by person decreases, and so moment caused by P decreases, and since the perpendicular distance from pivot Q to P is the same, this means force at P decreases.

so answer is A - hope that helps

Reply 2

anonymous294

Original post by mosaurlodon

Its about moments so
take the pivot to be at point P
Q makes a upward force and Weight makes a downward force
as the person walks from R to Q perpendicular distance decreases with same weight, so moment caused by person decreases, and so moment caused by Q decreases, and since the perpendicular distance from pivot P to Q is the same, this means force at Q decreases.
Same concept if you take pivot at Q
P makes a downward force and Weight makes a downward force
as the person walks from R to Q perpendicular distance decreases with same weight, so moment caused by person decreases, and so moment caused by P decreases, and since the perpendicular distance from pivot Q to P is the same, this means force at P decreases.
so answer is A - hope that helps