GCSE Questions: Forces

Q7. The following statements describe parts of a short train journey between two railway stations.

Part A:	The train accelerates at a constant rate from 0 m/s to 20 m/s in 40 s
Part B:	The train travels at a constant velocity for 260 s
Part C:	The train decelerates at a constant rate coming to a stop in 60 s

(a) During which part of the journey is the resultant force on the train zero?

Part B

[1 mark]

(b) Here is part of the velocity-time graph for the train journey.

Complete the graph so that it shows part B and part C of the train journey.

horizontal line drawn from (40, 20) to (300, 20)

straight line drawn from the point where line B finishes to 0 m/s

finishing on the x-axis at 360 s

[3 marks]

acceleration = change in velocity/time taken

a = Δv/t

[1 mark]

(d) Another train accelerated at 1.15 m/s² for 22.0 s

Calculate the increase in velocity of the train.

a = Δv/t

Δv = at

Δv = 1.15 x 22.0

Δv = 25.3 m/s

[3 marks]

[8 Marks TOTAL]