Question

Which situation shows unbalanced forces acting on an object?
a.
A book at rest on a table.
c.
A book sliding on a table top.
b.
A person standing still.
d.
None of the above.

I think it's c, but would just like to make sure. Thanks!

Answer 1

@Dan.Harrison @ganeshie8

Answer 2

I would intuitively chose C. There must be an applied force for the book to slide on a horizontal surface. Also, when the object moves (unless it's a really well polished surface) there would be the force of friction acting too. So once the applied force is removed, the frictional force is still acting in accordance with the coefficient of friction and the object's normal force.

Answer 3

@ganeshie8 what do you think?

Answer 4

I'm going to go with c.

Answer 5

Yay I got it right! Thanks for the help!

Answer 6

No problem!

Answer 7

Congrats! If it slid at a constant velocity, though, forces would still be balanced. Just food for thought.