A gymnast wants to work out the biggest pressure that he can exert on the ground. He works out that the area of his hand is 120 cm2, and the area of his foot is 240 cm2.
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Explanation:
A force of 20 N acts over an area of 4 m2. Calculate the pressure.
pressure = force ÷ area
= 20 N ÷ 4 m2 = 5 N/m2
Notice that the unit of pressure here is N/m2 (newtons per square metre). Sometimes you will see another unit being used. This is called the pascal and it has the symbol Pa.
1 Pa = 1 N/m2, so in the example above the pressure is 5 Pa.
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