Pressure 3
A girl wearing a trainer on one foot and a stiletto on the other exerts the most pressure on the ground with the stiletto.

Pressure 3

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The smaller the surface area, the bigger the pressure. Try cutting a fruit with the flat side of a knife. Now try the thin side - it will cut smoothly. The flat side has a greater surface area, therefore less pressure. This is a good practical example of pressure.

Try our third Science quiz on Pressure.

1.
What force is needed on an area of 4m2 to produce a pressure of 16Pa?
0.25N
4N
64N
64Kg
Force = pressure x area = 16 x 4 = 64N
2.
Box A has a weight of 20N. It is put on top of box B. These two boxes exert a pressure of 60Pa. The area box B covers is 3m2. Find weight of box B.
60N
80N
160N
180N
Force = 60 x 3 = 180N, box A = 20N so box B = 180-20N
3.
A girl is wearing a trainer on one foot and a stiletto on the other! Which exerts the most pressure on the ground?
Both the same
Stiletto heel
They don't exert a pressure
Trainer
The force (girl's weight) is the same but a stiletto heel has the smallest area
4.
What force is needed on an area of 5m2 to produce a pressure of 25Pa?
5N
20N
30N
125N
Force = pressure x area = 25 x 5 = 125N
5.
The bottom of a box has an area of 5m2. What is the weight of the box to produce a pressure of 20Pa?
4N
100N
4Kg
100Kg
Force = 20 x 5 = 100N. Remember weight is a force
6.
What has to happen to the force exerted over a fixed area if the pressure doubles?
The force must decrease
The force must double
The force must increase
The force must stay the same
7.
The dimensions of a ski are 8cm x 150cm. What is the weight of a skier standing on 2 skis to produce a pressure of 2,500Pa?
500N
600N
900N
2,400N
Area of ski = 0.08 x 1.50 = 0.12m2 x 2 (for 2 skis), force = pressure x area = 2,500 x 0.24 = 600N
8.
A four legged table exerts a pressure of 8,000Pa on the ground. Each leg has an area of 0.01m2. What is the weight of the table?
32N
80N
320N
320Kg
Force = pressure x area = 8,000 x (4 x 0.01) = 320N
9.
What has to happen to the force exerted if the area doubles but the pressure is unchanged?
The force must decrease
The force must double
The force must increase
The force must stay the same
10.
The bottom of a box has dimensions 2m by 3m. What is the weight of the box to produce a pressure of 20Pa?
4N
26N
100N
120N
Area = 2 x 3 = 6m2, force = 20 x 6 = 120N
Author:  Sue Davison

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