dance_sg said:yes I am one hundred percent sure.
kuruman said:This bothers me. Consider a real life freight train moving at the same initial speed and stopping in the same time. Surely the average force acting on it must be greater in this case. Something is missing or the problem cannot be done the way it is phrased.
Right. As I said, there is not enough information given to solve for the net force.kuruman said:Something is missing or the problem cannot be done the way it is phrased.
In order to calculate friction force in a toy train example, you will need to know the mass of the train, the coefficient of friction between the train and the surface it is moving on, and the acceleration of the train. You can then use the formula F = μmg, where F is the friction force, μ is the coefficient of friction, m is the mass of the train, and g is the acceleration due to gravity (9.8 m/s²).
The coefficient of friction is a value that represents the amount of resistance between two surfaces in contact with each other. It is a dimensionless number and can range from 0 (no friction) to 1 (high friction). The higher the coefficient of friction, the greater the friction force will be between the two surfaces.
The mass of the toy train plays a significant role in the calculation of friction force. The greater the mass of the train, the greater the force of gravity acting on it. This means that the train will have a higher downward force, resulting in a higher friction force needed to overcome this downward force and move the train forward.
In some cases, the friction force can indeed be greater than the applied force on the toy train. This is because the amount of friction force depends on the coefficient of friction and the weight of the train, while the applied force may be limited. This can result in the train not moving or moving at a slower rate than expected.
The type of surface on which the toy train is moving can greatly impact the calculation of friction force. Different surfaces have different coefficients of friction, so the same train may experience a different friction force when moving on a rough surface compared to a smooth surface. Additionally, the condition of the surface (such as being wet or covered in debris) can also affect the calculation of friction force.