Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward from their seats when a speeding bus stops suddenly, (c) it is easier to pull a lawn mower than to push it, (d) a cricketer moves his hands backwards while holding a catch.

Explain why (a) a horse cannot pull a cart and run in empty space, (b

1.	Explain why (a) a horse cannot pull a cart and run in empty space, (b) passengers are thrown forward from their seats when a speeding bus stops suddenly, (c) it is easier to pull a lawn mower than to push it, (d) a cricketer moves his hands backwards while holding a catch.
Answer» Solution :(a)whenhorsepullscartitsfeetappliesdifiniteforcecertainangleon thesurfaceon feetof THEHORSE. Duetocomponentofforcecart comesintomotion . ( b)Whenbusis inmotiondue toinertiapassengerinsidethe busalsoare inmotionwhen thebussuddenlystopdue toarethrownforwardtheirseats . (c ) To pulllawnmoverforceis appliedbymakingangle `THETA`withhorizontalshowninfigureverticallycomponentof thisforce ismg sin `theta` DUETO thisnetforcewillbecomemg -F sin ` theta` Whenmachineis givenpushforceis appliedby makingangle `theta`downwarddirectioncomponentof forcein downward directionwill bemg +F sin `theta`.Dueto thisis EASY topulllawnmoverinsteadof pushingit. (d ) Whencricketcatchesballby takinghishandin backward directionthesebyincreasetimeof contactbetweenballandhencelessforceact on handimpulseofforceincrease.