The diagram shows a tank that is filled with oil. The density of the oil is $920 \raisebox{1ex}{$kg$}\!\left/ \!\raisebox{-1ex}{$m^3$}\right..$

Calculate the weight of the oil in the tank.

The diagram shows a tank that is filled with oil. The density of the oil is $920 \raisebox{1ex}{$kg$}\!\left/ \!\raisebox{-1ex}{$m^3$}\right..$

Now calculate the pressure using $p=hpg.$ Do you find the same answer$?$

The diagram shows a tank that is filled with oil. The density of the oil is $920 \raisebox{1ex}{$kg$}\!\left/ \!\raisebox{-1ex}{$m^3$}\right..$

The pressure on the bottom of the tank is caused by the weight of the oil. Calculate the pressure using:

$P=\frac{F}{A}.$

A student measures an unstretched spring. He adds weights to the spring and measures its new length each time.

Copy the correct equation that shows how to calculate the extension of the spring.

extension $=$Length of spring $-$load

extension $=$Original length $-$Length when stretched

extension $=$Length when stretched $-$Original length

A student measures an unstretched spring. He adds weights to the spring and measures its new length each time.

Copy the correct graph to show the extension of a spring changes as the load on it is increased.

Hooke's law describes how extension of a spring relates to the load on the spring. 

State Hooke's law in words.

Hooke's law describes how extension of a spring relates to the load on the spring.

Hooke's law can be written as $F=kx$. Rewrite this as a word equation.

Hooke's law describes how the extension of a spring relates to the load on the sprint.

Sketch an extension-load graph for a spring that obeys Hooke's law. Mark the part of the graph that shows that the spring obeys Hooke's law. Mark also the limit of proportionality.

Copy and complete the following sentence, by writing either increases / decrease  in each gap.

Pressure $\dots \dots \dots$ When the force acting increases.