- Which one of these statements is NOT true about Robert Hooke?
- He lived in the Seventeenth Century.
- He discovered that the extension is proportional to the force.
- He made very detailed drawings of the human flea (
*Pulex irritans*). - He was executed for high treason.

- The graph for force against extension is:
- a straight line through the origin, indicating direction proportionality.
- a straight line that makes a positive value of intercept on the y-axis.
- a straight line that makes a negative value of intercept on the y-axis.
- a curve.

- The gradient of the force-extension graph tells us:
- the force applied;
- the spring constant;
- the energy contained in the spring;
- the extension.

- The energy contained in a spring is represented by:
- the gradient of the force-extension graph;
- the gradient of the extension-force graph;
- the intercept of the extension-force graph
- the area under the force-extension graph.

- The units for the spring constant are:
- N m
- N m
^{-1} - J
- N kg
^{-1}

- A spring is made up of 3 springs in series that each have a force constant of 25 N m
^{-1}. A 1 N weight is added. The resulting stretch is:- 1.3 cm
- 4 cm
- 8 cm
- 12 cm

- The force constant (in N m
^{-1}) of the spring made up in question 6 is:- 0.12
- 4.0
- 8.3
- 25

- When rubber is loaded and unloaded, it is found that some energy is lost. This lost energy is called:
- hysteria;
- hysteresis;
- histrionics;
- history.

- Rubber has a strange force extension curve because:
- the molecules are arranged neatly and the bonds act as springs.
- the molecules have no order and no bonds.
- the molecules are long chains that are tangled like spaghetti.
- the disulphide bridges make the material plastic.

- Rubber is an example of a long chain molecule called a:
- monomer;
- elastomer;
- plastomer;
- isomer.