b) (i) When the wagon’s brakes are off, the engine pulls the wagon forwards. A frictional force also acts on the wagon. In what direction does the frictional force act?
1 mark
Question 28
28.
(ii) The pull of the engine is 5000 N. When the wagon’s speed is increasing, how large is the frictional force?
Question 29
29.
After a while, the wagon travels at a steady speed. The engine is still pulling with a force of 5000 N.