IB Physics SL A 1 9 Fluid Resistance on Projectiles Questions

Practise IB Physics SL A.1.9 by explaining how fluid resistance changes speed and acceleration during a fall or projectile motion.

Exam points

Describe the effects of fluid resistance on projectile trajectory, flight time, velocity, acceleration, range and terminal speed.
Explain how drag changes projectile motion and produces terminal speed using complete mark-scheme evidence.

[Maximum number: 3]

This question is about kinematics.

After the stone in (a) hits the water surface it rapidly reaches a terminal speed as it falls through the water. The stone leaves Fiona's hand at time t=0. It hits the water surface at $t_{1}$ and it comes to rest at the bottom of the water at $t_{2}$ . Using the axes below, sketch a graph to show how the speed v of the stone varies from time t=0 to just before $t=t_{2}$ . (There is no need to add any values to the axes.)

Figure for Question IB Physics SL A 1 9 Fluid Resistance on Projectiles Questions question 1 — IB Physics SL

Figure for Answer to Question IB Physics SL A 1 9 Fluid Resistance on Projectiles Questions question 1 — IB Physics SL

straight line to water surface;
clear decrease after hitting surface;
constant non-zero speed reached smaller than maximum; $; \begin{aligned} & \text { (speed must be less than } \\ & \text { maximum velocity) }\end{aligned}$

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IB Physics SL A 1 9 Fluid Resistance on Projectiles Questions question 1