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3.3 R: Forces and Newton's laws

3.3 R: Forces and Newton's laws

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Question 14

A train of total mass 15000 kg travels along a straight horizontal track.

The engine provides a constant driving force of 12000 N. The total resistance to the motion of the train is constant and of magnitude 4500 N.

a.

Find the acceleration of the train.

[2]
b.

The driving force is now removed and a constant braking force is applied, in addition to the resistance. The train comes to rest from a speed of 20 m s−1^{-1}−1 in 25 seconds. Find the magnitude of the braking force.

[4]
Markscheme

3.3 R: Forces and Newton's laws Questions

  1. A Level
  2. /Maths
  3. /3.3 R: Forces and Newton's laws

139 exam-style questions on AQA A Level Maths 3.3 R: Forces and Newton's laws, covering 3.3.1 Concept of a force and Newton's first law, 3.3.2 Newton's second law, 3.3.3 Weight and motion under gravity, 3.3.4 Newton's third law and equilibrium, 3.3.5 Addition of forces and resultants (A-level only), and 3.3.6 Friction (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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