Khan Academy Static

4A: How do forces work inside an elevator or when you slide a box across the floor? Normal forces are forces which act perpendicularly to surfaces. When you see a patient in a hospital bed, the reason he does not fall through the bed is because the ground provides the patient with a normal force that directly opposes the force of the Earth’s gravity on your the body (this is why you aren’t sinking to the Earth’s core right now). We will walk through real-world physical examples like these to shed light on normal forces.

15142_Normal_force_in_an_elevator.html

15140_Balanced_and_unbalanced_forces.html

15141_Normal_force_and_contact_force.html

15143_Slow_sock_on_Lubricon_VI.html

15144_Normal_forces_on_Lubricon_VI.html