When the lid of a freezer is opened, it pivots about the hinge at the back of the freezer. The handle is at the front. Fig. 3.1 is a side view of the freezer. [Figure 3.1] The handle is 0.70m from the hinge. The lid has a mass of 2.0 kg.

1. (a)The gravitational field strength g is 10N/kg.
2. (a)(i)Calculate the weight of the lid. weight = ....................................................................[1][1]
3. (a)(ii)The lid is uniform and its centre of mass is at its centre. The weight of the lid produces a moment about the hinge.
4. (a)(ii)1.Calculate the moment about the hinge when the lid is closed. moment = ..............................................................[2][2]
5. (a)(ii)2.The moment required to open the lid is greater than the value calculated in (a)(ii)1. Suggest one reason for this. ............................................................................................................................................... ...............................................................................................................................................[1][1]
6. (b)The lid is closed. To open the lid, a force Fis applied to the handle as shown in Fig. 3.1. The direction of Fis vertically upwards and Fis the smallest possible force that opens the lid. A force on the handle in any other direction must be larger than Fin order to open the lid. Explain why. ............................................................................................................................................... ...............................................................................................................................................[1][1]

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