question_answer

A lorry and a car are moving with the same acceleration. Which requires more force to stop it?

Answer:

We know that, the mass of the lorry is greater than the mass of car i.e., \[{{m}_{lorry}}>{{m}_{car}}\] Both are moving with the same acceleration \[\Rightarrow {{a}_{lorry}}>{{a}_{car}}\] Which requires greater force to stop? i.e., \[{{F}_{lorry}}?\,\,{{F}_{car}}\] We know, \[F=ma\] \[\Rightarrow F\propto m\] (\[\therefore \] ?a? is constant) \[\therefore \]from the above equation, it is clear that greater force is required to stop the body with more mass. \[\Rightarrow {{F}_{lorry}}>{{F}_{car}}.\]