O-LevelPhysicsForces5054/22 · Oct/Nov 2021 · Q18 Marks

Fig. 1.1 shows a jug of liquid and an empty measuring cylinder that is on an electronic balance. [Figure 1.1] (a) The electronic balance uses the weight of the measuring cylinder to determine its mass. Weight and mass have different units. State two other ways in which weight differs from mass. 1. 2.

(a)The electronic balance uses the weight of the measuring cylinder to determine its mass. Weight and mass have different units. State two other ways in which weight differs from mass. 1. 2.[2]
(b)Describe how to determine the density of the liquid using the apparatus shown in Fig. 1.1.[4]
(c)The density of the liquid is 780kg/m³. Determine the volume of 0.65 kg of the liquid. volume =[2]

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Mark scheme

Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.

[B2] any two from: weight / it is a vector / has a direction weight / it is a force weight / it depends on location / gravitational field strength weight / it is measured with a spring balance (not a beam balance) / electronic balance / top-pan balance / newton meter
[B1] (pour liquid into) measuring cylinder and read / find the volume OR zero the reading on the balance
[B1] take reading on balance or find the mass (of full measuring cylinder) OR (pour liquid into) measuring cylinder and read/find the volume
[B1] subtract original reading / 34.9 g (from reading on balance) OR take reading on balance or find the mass (of full measuring cylinder)
[B1] divide difference between readings by volume OR divide (final) reading on balance by volume
[C1] (p =) 0.65 /780
[A1] 8.3 x 10⁻⁴ m³ or 830 cm³

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