CAIE IGCSE Physics 1.8 Pressure Topic Practice

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Covered syllabus points

1.8.1—Pressure as force per unit area1.8.2—Pressure varies with force and area in1.8.3—Qualitatively how the pressure beneath1.8.4—Recall/use: for the change in pressure

Question 1

[Maximum number: 2]

A car has a weight of 13000 N . The car is supported by 4 tyres. The area of each tyre in contact with the road is 0.016 m20.016 \mathrm{~m}^{2}.

Calculate the pressure on the road due to the weight of the car.

pressure =

Question 2

[Maximum number: 7]

Question (a)

(a)

Fig. 3.1 shows a person moving across an ice-covered pond to reach a ball on the ice.

Fig. 3.1

Fig. 3.1

Explain why this way of moving across the ice is safer than walking. Use your understanding of pressure in your answer.

[ 3 ]

Question (b)

(b)

Fig. 3.2 shows a side view of the pond with a layer of ice floating freely on the water.

Fig. 3.2

Fig. 3.2

The surface area of the pond is 5.0 m25.0 \mathrm{~m}^{2}.
The mass of the ice is 690 kg.
The density of water is 1000 kg/m31000 \mathrm{~kg} / \mathrm{m}^{3}.
Point X is 0.45 m below the ice.
Calculate the pressure at point X due to the ice and the water.
pressure =

[ 4 ]

Question 3

[Maximum number: 1]

Which row describes how the pressure beneath the surface of a liquid depends on the depth below the surface and on the density of the liquid?

depth below surface

density of liquid

pressure decreases with increasing depth

pressure decreases with increasing density

pressure decreases with increasing depth

pressure increases with increasing density

pressure increases with increasing depth

pressure decreases with increasing density

pressure increases with increasing depth

pressure increases with increasing density

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