450 GENERAL SCIENCE 



6. Why do railway coaches " telescope " in a collision? 



7. Why can an athlete make a longer running jump than a 

 standing one? 



8. Why can a quoit be kept in a plane by giving it a twist? 



9. Why can a small boy spill out the occupants of an express 

 wagon by giving the wagon a sudden jerk? 



10. Why will a train continue moving after the locomotive has 

 been uncoupled at a flying switch? 



11. When a car moves swiftly around a curve, why are the stand- 

 ing passengers moved across the car toward the outside of the curve, 

 although holding to the straps? 



12. Why is it possible to fill the tank in the tender of a locomotive, 

 while the locomotive is moving rapidly, by lowering a scoop con- 

 nected with the tank into a trough of water placed between the rails? 



13. Why is it difficult to set in motion the massive doors of a 

 large vault? 



14. Why will mud and water leave the rim of a moving carriage 

 wheel in a direction tangent to the rim? 



17. Why is it possible to remove snow from the shoes by kicking 

 the feet against the doorstep? 



18. When one shovels coal he swings the shovel full of coal 

 forward, then suddenly stops the shovel; why does the coal con- 

 tinue forward? 



19. When a street car stops suddenly, the passengers lurch for- 

 ward; when it starts suddenly, the passengers are thrown back- 

 ward. Why? 



20. When one jumps off a moving street car he is thrown violently 

 to the ground. Why? 



21. When a runner " stubs his toe " he falls forward. Why? 



22. Why is it possible for a clothing salesman to remove a coat 

 from the bottom of a pile by giving it a quick jerk? 



23. If one pulls a plate full of soup quickly toward him, the 

 soup spills out on the opposite side. Why? 



24. A bullet thrown against a window shatters the glass; if it 

 is shot through the window it leaves a clean hole. Why? 



25. A carpenter tightens the head of his hammer by striking the 

 end of the handle on a beam. Why? 



