True/Faise
13. A force acting in the direction an object is moving does positive work.
14. Kinetic energy is a vector quantity.
15. The gravitational potential energy of a moving object is always zero.
16. When mechanical energy is conserved, the kinetic energy you end up with always equ
gravitational potential energy you start with.
17. A force acting perpendicular to an object's displacement does negative work.
18. Energy can be converted from one form to another form.
19. The force needed to lift an object at a constant speed is equal to the weight of the ob
20. Centripetal forces do zero work on an object.​