*This Science quiz is called 'Pressure 3' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.*

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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.

The bottom of a box has an area of 5m^{2}. 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

2.

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

3.

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 = 0.12m^{2} x 2 (for 2 skis), force = pressure x area = 2,500 x 0.24 = 600N

4.

What force is needed on an area of 5m^{2} to produce a pressure of 25Pa?

5N

20N

30N

125N

Force = pressure x area = 25 x 5 = 125N

5.

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 3m^{2}. Find weight of box B.

60N

80N

160N

180N

Force = 60 x 3 = 180N, box A = 20N so box B = 180-20N

6.

What force is needed on an area of 4m^{2} to produce a pressure of 16Pa?

0.25N

4N

64N

64Kg

Force = pressure x area = 16 x 4 = 64N

7.

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

8.

A four legged table exerts a pressure of 8,000Pa on the ground. Each leg has an area of 0.01m^{2}. 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 = 6m^{2}, force = 20 x 6 = 120N

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