What is the force of friction that is acting on the block of ice? Solution: On a flat surface, the normal force on an object is given by N = mg. With this, we can find the force of friction as follows: F f =μN F f =μmg Substituting the values in the above equation we get, F f =0.05 × 300 kg × 9.8 m/s 2 = 147 kg-m/s 2 or 147 N. TRUE + FALSE = 1. TRUE + TRUE = 2. If we want to get the result as TRUE, we directly use the TRUE formula, and Excel will return the logical value TRUE as output. For Example: IF (23>0, TRUE ()) , IF (45<100, TRUE) Logical expressions automatically return Boolean values TRUE or False as output.