Question

g A uniform meter stick has a 150 g rock suspended from the zero position and balances when a fulcrum is placed at the 25.0 cm position. What is the mass of the meter stick

Answer 1

The mass of the metre stick given the data from the question is 150 g

From the diagram (See attached photo)

• Clock wise moment = M × 25
• Anticlockwise moment = 150 × 25
• Mass of metre stick (M) =?

How to determine the value of M

Clock wise moment = Anticlockwise moment

M × 25 = 150 × 25

M × 25 = 3750

Divide both sides by 25

M = 3750 / 25

M = 150 g

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