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Shivam Bhagat Grade: 9
```        A train is moving at a constant speed on horizontal rails. Then from Newton’s laws it can be inferred that-
(a)     the engine is shut off
(b)     the engine is necessarily providing a constant driving force
(c)     the engine supplies a constant power
(d)     no force acts on the train```
6 years ago

## Answers : (4)

510 Points
```										here we have two cases
1) if there is no friction bw rails & tyre & train is moving with constant velocity then ,
there will be no force acting on the train along horizontal direction & option a) is correct...

2)but if there exists friction & train is moving with constant velocity then ,
there exists a constant force which is along the direction of motion and equal in magnitude of friction force...
we know power = F*V = product of force & velocity
when both force & velocity are constant then power will also become constant so for this case
b) , c) are correct
```
6 years ago
Black Widow
36 Points
```										the answer is d
as
if there is friction then a is wrong
if there is no friction then b and c are wrong
```
6 years ago
Aman Bansal
592 Points
```										dear shivam,
in ideal conditions, that is, if there is no friction between rails and wheels then answer (A) the engine is shut off must be correct,
but in practical conditions , there exists a friction, therefore answer must be (B).
since nothing is mentioned about the friction we will assume practical conditions hence answer must be (B)

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```
6 years ago
Fawz Naim
37 Points
```										option d is correct, no force is acting on the train as the force due to friction is cancelled by the driving force
```
6 years ago
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