What is the guaranteed outcome when unbalanced forces act upon an object?

The object's motion will change.

The object will become weightless.

A book is sitting perfectly still on a flat table. What must happen for the forces on the book to become unbalanced and cause it to move?

The force of gravity must suddenly disappear.

The table must be perfectly level and smooth.

An additional force, like a push or pull, must be applied to the book.

The upward force from the table must exactly equal the downward force of gravity.

The upward buoyant force becomes greater than the downward force of gravity.

A small fan in the room is turned on, pushing it sideways.

The temperature in the room increases slightly.

Some helium leaks out, reducing the upward buoyant force.

When an object remains stationary.

When the net force on an object is zero.

When one force acting on an object is stronger than an opposing force.

When an object moves at a constant velocity.

A car driving at a constant 60 mph on a straight highway.

A satellite orbiting the Earth at a steady speed.

An apple hanging motionless from a tree branch.

A soccer ball slowing down as it rolls across a grassy field.