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1.5.1a Forces, resultant force and motion

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Question 128

A research submarine is descending vertically downwards through the water. Three vertical forces act on it.

The weight acts downwards and is equal to 18 000 N18\,000\text{ N}18000 N.

The buoyant force (upthrust) acts upwards and is equal to 15 000 N15\,000\text{ N}15000 N.

What is the water resistance force acting on the submarine when it is descending at a constant speed?

A

3 000 N3\,000\text{ N}3000 N upwards

B

3 000 N3\,000\text{ N}3000 N downwards

C

33 000 N33\,000\text{ N}33000 N upwards

D

33 000 N33\,000\text{ N}33000 N downwards

Markscheme

1.5.1a Forces, resultant force and motion Questions

  1. IGCSE
  2. /Physics
  3. /1.5.1a Forces, resultant force and motion

183 exam-style questions on CIE IGCSE Physics 1.5.1a Forces, resultant force and motion. Each one has a worked solution and a mark scheme showing where the marks go.

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