A force applied to a solid object may cause it to accelerate so that its velocity changes.

1. (a)State two other properties of the object which may change when a force is applied. 1. 2.[2]
2. (b)(i)A spring has a mass of 0.012kg. The gravitational field strength g is 10N/kg. Calculate the weight of the spring.[1]
3. (b)(ii)The spring is suspended vertically and a load is attached to its lower end. The spring extends by 2.7cm and does not pass the limit of proportionality. [Figure 2.1] shows the spring and load attached to the lower end of a second identical spring. Suggest one reason why the extension of the second spring differs from 2.7 cm.[1]
4. (b)(iii)Explain what is meant by limit of proportionality.[1]
5. (c)(i)The load in [Figure 2.1] is pulled down below its equilibrium position. State the form of energy stored in the stretched springs.[1]
6. (c)(ii)The load is released and it moves upwards and downwards. The distance travelled in each movement decreases until the load stops moving. Explain why the load stops moving.[1]

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