As a result of friction between internal parts of an isolated ...

[sabina]

As a result of friction between internal parts of an isolated system
 a. the total mechanical energy of the system increases.
  b. the total mechanical energy of the system decreases.
  c. the total mechanical energy of the system remains the same.
  d. the potential energy of the system increases but the kinetic energy remains the same.
  e. the kinetic energy of the system increases but the potential energy of the system remains the same.

Question 2

Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclined plane by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the plane has the same value k. At the highest point,
 a. KA > KB.
  b. KA = KB.
  c. KA < KB.
  d. The work done by F on A is greater than the work done by F on B.
  e. The work done by F on A is less than the work done by F on B.

[amcvicar]

Answer to Question 1

b

Answer to Question 2

a

[sabina]

TYSM

[tkempin]

Gracias!