Question

two objects p and Q of masses 15 kg and 65 kg are moving with the same speed.which one need a greater force to stop it and why?​

Answer 1

The one with the mass 65kg needs a greater force to stop becoz it's mass is more than the mass of the other obeject

Force = ma

Force is directly proportional to Mass and Acceleration

Answer 2

let both have same coefficent of friction

on 15kg

friction ÷ mass = acc

u×150 ÷ 15 = acc

10u in opposite direction if velocity = acc

on 65kg

friction ÷ mass = acc

u650÷65 =acc

10u in opp direction of velocity = acc

so both will have same accelaration

But force of friction diff

friction force more on 65kg = 650u N

friction force less on 15kg = 150u N