Summative Practice – Form 5 Science (KSSM) Chapter 8

Question 1:
Figure 1 shows two vehicles moving with the same velocity and producing two different pressures, P0 and P1.

(a) Which pressure is lower?
(b) Explain your answer in question 1(a).
(c) Why is the situation of the two vehicles shown in Figure 1 dangerous?

(a) P1

When air flows through the narrow space between the two cars,the velocity of air flow increases and the pressure, P1 in the narrow space reduces.
According to Bernoulli’s principle, when a fluid such as air passes through a narrow space, the velocity of the fluid flow increases and pressure in the space decreases.

Pressure P0 which is higher compared to P1 will cause both vehicles to be pushed towards each other until they collide.

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