IGCSE Physics 5.5 Pressure equation Topic Practice

Know and use the relationship between pressure, force and area: forcepressure area=

[Maximum number: 3]

Diagram 1 shows an ice cube floating at rest in a beaker of water.

Diagram 1

(a)

Diagram 2 shows the ice cube pushed down into the water by force X.

The ice cube is at rest in this new position.

Diagram 2

[ 3 ]

(i)

State the formula linking pressure, force and area.

[ 1 ]

(ii)

The area of the base of the ice cube is $0.0017 \mathrm{~m}^{2}$ .

Calculate the upward force on the bottom of the cube from the water due to the pressure difference.
upward force =

[ 2 ]

[Maximum number: 4]

A student investigates how much pressure she exerts on the ground when she is standing up.

(a)

The student measures the area of one of her feet when it is in contact with the ground. She draws around her foot on a piece of squared paper.

grid not to scale

[ 4 ]

(i)

State the formula linking pressure, force and area.

[ 1 ]

(ii)

The weight of the student is 520 N.

Calculate the pressure the student exerts on the ground when she is standing on both feet.

Give the unit.

pressure = ............ unit ............

[ 3 ]

[Maximum number: 3]

This question is about pressure.

A teacher does a demonstration using an inflated balloon and a board with many sharp nails.

The teacher pushes the balloon onto the board of nails. The balloon does not pop. The teacher then pops the balloon using a single nail.

Explain why the balloon does not pop when pushed onto the board of nails.

[Maximum number: 6]

This is a question about a melting ice cube.

(a)

The diagram shows an ice cube placed on the ground.

[ 6 ]

(i)

The mass of the ice cube is 3.7 g and its area of contact with the ground is $2.6 \times 10^{-4} \mathrm{~m}^{2}$ .

Calculate the pressure the ice cube exerts on the ground. Pa

[ 4 ]

(ii)

The ice cube melts and becomes a puddle with a larger cross-sectional area.

Explain how the pressure of the ice cube on the ground changes when it melts.

[ 2 ]

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Question 4

Question 4(b)

Question 4(b)(iii)

Question 4(b)(iv)

Question 4

Question 4(b)

Question 4(b)(ii)

Question 4(b)(iii)

Question 7(b)

Question 9

Question 9(a)

Question 9(a)(i)

Question 9(a)(ii)