A rider on horse back falls when horse starts running all of a sudden because
Rider is taken back
Rider is suddenly afraid of falling
Inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse
None of the above
A rider on horse back falls when horse starts running all of a sudden because
Visualize the horse and man as part of the same system with the man as the upper part and horse as the lower part. When the horse moves, lower part starts to move but due to inertia the upper part wants to remain at rest.