physics
posted by alexa .
A locomotive pulls a series of wagons. Which is the correct analysis of the situation?
A. because action always equals the reaction,the locomotive cannot pull the wagons,the wagons pull backward just as hard as the locomotive pulls forward, so there is no motion.
B. The train moves forward because the locomotive pulls forward slightly harder on the wagons than the wagons pull backward on the locomotive
C. the locomotive gets the wagons to move by giving them a tug during which the force on the wagons is momentarily greater than the force exerted by the wagons on the locomotive
D. the locomotive can pull the wagons forward only if it weighs more than the wagons
E. The locomotive's force on the wagons is as strong as the force of the wagons on the locomotive,but the frictional force on the locomotive is forward and large while the backward fricitonal force on the wagons is small.

physics 
bobpursley
Very poor question.
a. would be true if the word "accelerating" were inserted between "no motion". As it is, it is false
b. if Locomotive pulls means net force of the locomotive, it is false, unless the train is accelerating.
c. Again, true during the moment of acceleration.
d. nonsense
e. nonsense.
So the question is what does the question mean "a locomotive pulls a series of wagons" This is very indefinite. The central question is the train accelerating, constant motion (including stopped)?
I suspect Your instructor mean c to be the only right answer, but instructors get paid to do better than this.
If net force is greater than retarding force, acceleration happens. If net force is equal to retarding force, acceleration is zero, and the system remains in whatever motion it was in.
Respond to this Question
Similar Questions

math
wagons retail for $49.97. stores receive the wagons with a 40% profit margin. what is the cost? 
physics
A girl pulls a toy train with a horizontal force of 10N The tention between the locomotive and the carrdge is 3N the friction on the carrydgers in and the mass of the locomotive and carrydge are 2 kg and 1kg respectively now calculate … 
Math
Ten rabbits are riding in wagons. Two rabbits sit in each wagon. How many wagons are there? 
Physics
Locomotive A travels 100km/hr and locomotive B travels 140km/hr. Locomotive B starts 15 kilometers Behind locomotive A and travels on the same direction. Find the time elapsed and how far each traveled before they meet. 
PHYSICS
a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth … 
PHYSICS
a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth … 
math
The speed of a locomotive without any wagons attached to it is 40 kmph. It diminishes by a quantity which is proportional to the cube root of the number of wagons attached. if the speed of the locomotive is 34 kmph when 27 wagons are … 
physics
Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25.0 degrees west of north, and the resultant of these two pulls is 350.0 N directly northward. Use vector components … 
physics
A 2.6 kg toy locomotive is pulling a 1.7 kg caboose. The frictional force of the track on the caboose is 0.52 N backward along the track. If the train is accelerating forward is 3.1 m/s2, what is the magnitude of the force exerted … 
Physics
A locomotive pulls 12 identical freight cars. The force between the locomotive and the first car is 150.0 kN, and the acceleration of the train is 2 m/s2. There is no friction to consider. Find the force between the eleventh and twelfth …