Edexcel IGCSEPhysicsGeneral Applications10 Marks
A student uses the apparatus shown in Figure 14 to investigate moments.
- (a)State the principle of moments.[2]
- (b)(i)The student places a mass of 400 g on the left-hand side of the metre rule, as shown in Figure 14. The pivot is at the 50 cm mark. Show that the weight of the 400 g mass is approximately 4.0 N. [g = 9.8 N/kg][2]
- (b)(ii)The student places a weight on the right-hand side of the metre rule so that the rule is balanced. The centre of the 400 g mass is at the 10 cm mark. The centre of the weight is at the 80 cm mark. Calculate the size of the weight. Show your working.[3]
- (c)The student moves the pivot to the 40 cm mark. The 400 g mass remains at the 10 cm mark. Explain what the student must do to balance the metre rule.[3]
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Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- 14 (a) M1 for for (an object in) equilibrium / balanced (condition)
- A1 for total clockwise moment = total anticlockwise moment
- 14 (b)(i) M1 for F = m × g OR 0.400 × 9.8
- A1 for 3.92 (N) which is approximately 4.0 N
- 14 (b)(ii) M1 for calculation of distance of 400g mass from pivot (40 cm OR 0.4 m)
- M1 for calculation of moment of 400g mass (4.0 × 0.4) = 1.6 (Nm) OR F1d1 = F2d2
- A1 for 1.6 ÷ 0.3 = 5.3 (N)
- 14 (c) B1 for anticlockwise moment is now greater (than clockwise moment) / rule is unbalanced / rule will tilt left
- B1 for move the (right-hand) weight further away / move the (right-hand) weight to a larger distance from the pivot
- B1 for increase the (right-hand) weight / add more weights to the right-hand side
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