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4N upwards.
4 N upward
4 N upward
50 N upward
50 N upward
4N upwards.
4 N upward
4 N upward
Gravity.
It is gravity on earth
50 N upward
50 N upward
downward
When there is that force that pulls downward. Example, when you climb a mountain. You will fell that there is that gravity pulling downward.
It is the earth's gravity.
By applying an upward force on the object that is greater than the downward force of Earth's gravity acting on it. Somewhat the same thing that you do with your leg muscles when you walk upstairs, or go in for a jump shot.
Just add the forces on the desk. Use a positive sign for one direction, a negative sign for the opposite direction.