Force and Press...

A person used force ($$F$$), shown in the figure to move a load with a constant velocity on a given surface.
Identify the correct surface profile.

Which of the following statements is incorrect?

Suppose a ball is kept still on a level surface of a table.  At this condition, the ball is acted upon by _______.

Why does a straw get attracted towards another straw which is rubbed with a sheet of paper?

To move a roller, a force of $$300 N$$ is required. You alone can produce a force of $$30 N$$. How many of your friends who are equally strong as you should join you to move the roller?

The air pressure inside our body is equal to the ____?

A force of $$100N$$ is applied on an area of $$4m^2$$. the pressure being applied on the area is 

What happens, when the pressure inside a sealed bottle exceeds the atmospheric pressure?

Ink does not spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.

When the piston of a pump is pulled up, the pressure inside_____