Practice Normal Force in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The perpendicular contact force that a surface exerts on an object pressing against it, directed away from the surface.
The floor pushing up on you so you don't fall through — it acts at a right angle to whatever surface the object touches.
Example 1
easyA 8 \text{ kg} box rests on a horizontal floor. What is the normal force acting on the box? Use g = 9.8 \text{ m/s}^2.
Example 2
mediumA 5 \text{ kg} block rests on a ramp inclined at 30° to the horizontal. What is the normal force on the block? Use g = 9.8 \text{ m/s}^2.
Example 3
mediumA 10 \text{ kg} box on a horizontal floor has a 30 \text{ N} downward push applied to it. What is the normal force? Use g = 9.8 \text{ m/s}^2.
Example 4
hardA person (60 \text{ kg}) stands in an elevator accelerating upward at 2 \text{ m/s}^2. What normal force does the floor exert on the person? Use g = 9.8 \text{ m/s}^2.