What work is done by a friction force acting on an object?
Select one:
a. Always negative
b. Always positive
c. May be positive or negative depending on the choice of coordinate system
d. Always zero
1 answer
a. Always negative.
Select one:
a. Always negative
b. Always positive
c. May be positive or negative depending on the choice of coordinate system
d. Always zero
1 answer
1 answer
1 answer
1 answer
1 answer