PHYSICS · Multi-part · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion
Problem
A city bus is stationary at a stop. The driver suddenly starts the bus and, a few minutes later, brakes sharply to avoid a speed-breaker.
(i) State Newton’s first law of motion.
(ii) Explain why many standing passengers tend to fall backward when the bus starts suddenly.
(iii) Explain why the same passengers tend to fall forward when the bus brakes suddenly.
(iv) Name one safety device fitted in motor vehicles that takes advantage of this law and describe briefly how it protects passengers in such situations.