Page 129 - Science Coursebook

9.4 Pressure

Question
2 Explain the following; in your answers, use the words ‘pressure’, ‘force’
and ‘area’.
a A truck used in the desert has wide tyres.
b A cricket stump has a sharp point at one end.
c A drawing pin has a sharp point at one end and a large, flat head at

the other.

broad head
force

sharp point

Activity 9.4
Cricket stumps

Before a game of cricket, the players must
push the stumps into the ground. The

picture shows four different situations – small
the stump may be pointed or blunt, and force large
the force may be large or small. small large force
Use what you know about pressure to force force cricket
stump
decide which stump will go in furthest,
and which will go in the least.
blunt
Be prepared to explain your ideas to the pointed
rest of the class.

Summary
• Pressure is caused when a force acts on an area.

• A big force acting on a small area creates a high pressure.

9 Forces in action 127