Learn · problem bank
Work the physics before you open the solution.
Filter the complete Learn collection, make an attempt, and use the feedback the problem actually supports. Objective answers are checked; longer derivations are reviewed against an explicit point rubric.
- Problems
- 92
- Lessons
- 19
- Written sets
- 8
Work and progress stay on this device.
nf-1warm-upGuided solutionUnstarted
Normal force is not always mg
Incline normal force
AP
Problem
A 4.0 kg block rests on a frictionless 30° incline. Find the normal force.
Open a hint
Use the axis perpendicular to the incline. There is no perpendicular acceleration.
Common wrong turn
Using N = mg because the block is at rest.