An electrician holds a 3.2kg chandelier against a ceiling with a force of 53N [up].
What is the normal force exerted by the ceiling on the chandelier?
The normal force exerted by the ceiling on the chandelier is equal in magnitude and opposite in direction to the force exerted by the chandelier on the ceiling (as according to Newton's third law of motion).
Therefore, the normal force exerted by the ceiling on the chandelier is 53 Newtons [down].