Moments

Q1. A light uniform rigid bar is pivoted at its centre.

Forces act on the bar at its ends and at the centre.

Which diagram shows the bar in equilibrium?

Q2. The diagram shows a uniform metre ruler of weight 1.5 N pivoted 15 cm from one end for use as a simple balance.

A scale pan of weight 0.5 N is placed at the end of the ruler and an object of unknown weight is placed in the pan.

The ruler moves to a steady horizontal position when a weight of 2.5 N is added at a distance of 60 cm from the pivot as shown.

What is the weight of the object?