Which hurts more: being stepped on by someone in trainers or by someone in stiletto heels?
The heels: the same force on a tiny area
- Pressure
- The force on each square metre of a surface.
What are the units of pressure?
Force in N, area in m²
N/m²
More pressure or less?
The same force on a smaller area
More
Force 72 N, area 4 m². Find the pressure.
pressure =forcearea=724
Answer18 N/m²
Force 150 N, area 6 m². Find the pressure.
pressure =forcearea=1506
Answer25 N/m²
Force 72 N, area 4 m². Find the pressure.
pressure =forcearea=724
Answer18 N/m²
Pressure 15 N/m², area 3 m². Find the force.
15=force3
multiply both sides by the areaforce =15×3
Answer45 N
Force 72 N, area 4 m². Find the pressure.
pressure =forcearea=724
Answer18 N/m²
Force 84 N, area 6 m². Find the pressure.
pressure =forcearea=846
Answer14 N/m²
Force 72 N, area 4 m². Find the pressure.
pressure =forcearea=724
Answer18 N/m²
Pressure 18 N/m², area 5 m². Find the force.
18=force5
multiply both sides by the areaforce =18×5
Answer90 N
Force 72 N, area 4 m². Find the pressure.
pressure =forcearea=724
Answer18 N/m²
Force 210 N, pressure 30 N/m². Find the area.
30=210area
area × pressure = force, so dividearea =210÷30
Answer7 m²
A box weighs 240 N. Its base is 2 m by 1.5 m. Find the pressure on the floor.
80 N/m²Why does a drawing pin have a sharp point?
A small area gives more pressureA force of 270 N gives a pressure of 45 N/m². Find the area.
area = 270 ÷ 45 = 6 m²
A force of 96 N acts on an area of 8 m². Find the pressure.
12 N/m2A pressure of 25 N/m² acts on an area of 6 m². Find the force.
150 NA force of 140 N gives a pressure of 35 N/m². Find the area.
4 m2
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