no 1 you are spot on ball at rest in grass
2 if car stops people keep going newton 1 until the window tries to stop them seatbelts
3 yup to go forward he pushes boat back and may get wet
4 yup f=ma bigger f biggger a further it goes good game golf
5 bike and boy are moving but what about air resistance ?
6 if it's that the heavy mass doesn't go as far as the lighter masss f=ma f same m,a different then yes
Positively charged particle trajectories always follow electric field lines because the electric force on a positively charged particle is in the same direction as the electric field.
For any positive charge the electric field emerges radially outwards and it goes radially inwards for the negative charges.From the theory of electric field lines we know that they never intersect each other, either they get merged when the sources are unlike or they repel when the sources are alike. In other words the electric field lines align in the same direction as that of the field.So, when a positive charge is released into the an electric field they follow the direction of the field lines because they too have their field lines emerging radially outwards and hence these lines align in the direction of the field.