Moments, levers and gears

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Question 31
Easy

Figure 1 shows a mobile that a student makes to hang in a bedroom.

The horizontal wooden rod hangs by a thread from the ceiling at point P (the 50 cm mark).

Figure 1: A diagram of a decorative mobile. A horizontal metre rule is suspended from a support thread at point P, which is at the 50 cm mark. A star decoration, S, hangs from the 20 cm mark. On the right side of the pivot, other shapes are suspended to keep the rod balanced.

The moment of S about point P is 0.45 Nm.

Calculate the weight of S.

Use the equation:

moment=F×d \text{moment} = F \times d moment=F×d
[2]

Moments, levers and gears Questions

  1. GCSE
  2. /Physics
  3. /Moments, levers and gears