Hooke’s Law 1

A spring is stretched by hanging a piece of metal from it.

Which name is given to the force that stretches the spring?

An experiment is carried out to measure the extension of a rubber band for different loads.
The results are shown below.
\[
\begin{array}{|l|r|r|r|r|}
\hline \text { load/N } & 0 & 1.0 & 2.0 & 3.0 \\
\hline \text { length } / \mathrm{cm} & 15.2 & 16.2 & & 18.6 \\
\hline \text { extension/cm } & 0 & 1.0 & 2.1 & 3.4 \\
\hline
\end{array}
\]
Which figure is missing from the table?

The extension-load graph for a spring is shown. The unstretched length of the spring is \(17.0 \mathrm{~cm}\).

                           
When an object is hung from the spring, the length of the spring is \(19.2 \mathrm{~cm}\).
What is the weight of the object?

Two metal blocks \(\mathrm{P}\) and \(\mathrm{Q}\) have identical dimensions. They hang on identical spring balances.

What can be deduced about \(\mathrm{P}\) and \(\mathrm{Q}\) ?

A student adds weights to an elastic cord. He measures the length of the cord for each weight.
He then plots a graph from the results, as shown.

                           
What has he plotted on the vertical axis?

The diagrams show a steel spring and a graph of its length against the load applied to it.

                           
What is the extension of the spring when a load of \(20 \mathrm{~N}\) is applied to it?

The diagram shows a handle with three forces, each \(100 \mathrm{~N}\), applied to it. The handle is free to move.

                                                             
What is the effect of the forces on the handle?

Objects with different masses are hung on a spring. The diagram shows how much the spring stretches.

                                         
The extension of the spring is directly proportional to the mass hung on it.
What is the mass of object M?

A student adds weights to an elastic cord. He measures the length of the cord for each weight.
He then plots a graph from the results, as shown.

                                       
Which length has he plotted on the vertical axis?

A load is hung from a steel wire. The load is increased.
The length of the wire increases until the limit of proportionality is reached.
The load is now increased slightly.
What happens?