Question

A heavy box of mass 20 kg is placed on a horizontal surface find the normal reaction

Answer 1

Force exerted by the box = mg
= 20 × 9.8
= 196 N

AS FORCE = NORMAL REACTION

Normal Reaction = 196 N

HOPE IT HELPS

Answer 2

Force exerted by the box on the surface =mass×gravity
=20×9.8
=196 N
as the ground also exerted same force on the box which is normal reaction
✔normal reaction = 196 N