"friction produces heat. Write one disadvantage of this property?

Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches.

Explanation:

It plays important role in sports. Air resistance has disadvantages to ball games, where speed of ball reduces due to the friction. Example in football, badminton, cricket etc. Friction is also the reason for decreased speed of playing objects on ground as well, due to resistance by uneven ground.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered