Why are seat belts important in vehicles? Which law of motion explains their importance?

The force of attraction between two bodies at a certain separation is 10 N. What will be the force of attraction between them if the separation is reduced to half ?

Calculate the weight of a body of mass 10 kg in (a) kgf and (b) newton. Take g = 9.8 m s^-2

State the magnitude and direction of the force of gravity acting on a body of mass 5 kg. Take g = 9.8 m s^-2