Hey mq123,
An increase in normal force can simply be achieved, if that person pushes down on the table. Theory?Well, as the person is pushing down the table, there would be an increase in static friction. The increase in static friction would also cause the normal force to increase, as
. Lets say the amount of increase in static friction equals to a, then
, which proves that an increase in Static Friction would also cause an increase in normal force.
A decrease in the normal force can be achieved, if the person puts the table on an incline.Theory?Well, as if you put any object on an incline, the normal force would decrease. This can be proved, if you use the formula
, and as you may know that any object on an incline cant equal to 0 degrees or 180 degrees. The value of cos would also decrease, as cos 0/360 and cos 180 = 1, and any lower/higher that 180 and higher than 0 degrees, would end with a lower value of 1.
For example:
Lets say the person puts the table on an incline of 45 degrees and the table's mass is 2 kg
however, if the table was not on an incline, you would use the formula:
Hopefully this helps