State two further properties of the object that might change when a force is applied.
A spring of mass 0.012 kg is in a gravitational field where $g$ is $10\,\text{N kg}^{-1}$. Calculate the weight of the spring.
A spring is hung vertically with a load attached at its lower end. It extends by 2.7 cm and remains within the limit of proportionality. Fig. 2.1 shows the spring and load fixed to the lower end of a second identical spring. Suggest one reason why the second spring's extension is not 2.7 cm.
Explain what the limit of proportionality means.
The load in Fig. 2.1 is drawn down below its equilibrium position. State the type of energy stored in the stretched springs.
Once released, the load moves up and down. The distance it travels on each swing gets smaller and smaller until it comes to rest. Explain why the load stops moving.