"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.

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles