Question

4. The drawing below shows Alex and his daughter Florence playing on a see-saw. Alex has a mass of 90 kg, Florence has a mass of 30 kg and she is sitting 1.8 m from the pivot.

a) Find out at what distance from the pivot should Alex sit in order to balance the see-saw.

b) What would happen to Florence if Alex moves closer to the pivot than the equilibrium position. Explain your answer.

c) what are the two conditions of equilibrium?

Answer 1

a) He should sit 5.4 meters away from the pivot point because for every 30 kg the object or person needs to be 1.8 m from the pivot point and since Alex's weight is 3x as much you multiply 1.8 by 3

b) Florence would rise in the area because there is more force on Alex's side.

c) The net force and the net torque must both be at equal amounts.

Answer 2

$\huge\underline\mathcal\purple{BTS}$

$\huge\underline\mathcal\green{EXO}$