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1.5.2a Moment of a force

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Question 3

A student uses a vertical forcemeter and a set of different loads to determine the weight of a uniform metre rule, as shown in the experimental setup where one end of the rule rests on a bench acting as a pivot, and the other end is supported by the forcemeter.

a.

The student places a cylindrical load onto the metre rule. To locate the centre of the load, the student records the positions of its edges on the rule:

  • Scale reading at the left edge of the load = 58.3 cm58.3 \text{ cm}58.3 cm
  • Scale reading at the right edge of the load = 62.7 cm62.7 \text{ cm}62.7 cm

Determine the scale reading on the metre rule at which the centre of the load is located. Show your working.

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b.

The student measures the force FFF indicated by the forcemeter for different values of the load LLL. After plotting a graph of FFF on the yyy-axis against LLL on the xxx-axis, they find the line of best fit has the equation:

F=0.65L+0.84 F = 0.65 L + 0.84 F=0.65L+0.84

State the value of the vertical intercept y0y_0y0​ of the line on the FFF-axis.

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c.

The weight WWW of the metre rule is related to this intercept by the relationship:

W=2y0 W = 2 y_0 W=2y0​

Calculate the weight WWW of the metre rule.

[1]
d.

Suggest one possible practical source of inaccuracy in this experiment, assuming the procedure is carried out carefully.

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Markscheme

1.5.2a Moment of a force Questions

  1. IGCSE
  2. /Physics
  3. /1.5.2a Moment of a force

43 exam-style questions on CIE IGCSE Physics 1.5.2a Moment of a force. Each one has a worked solution and a mark scheme showing where the marks go.

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