You can change the angle θ to find out how normal force/friction force varies with angle.

Normal force N= m*g*cosθ

If m*g*sin< μ N , friction force f=m*g*sinθ

otherwise friction force f=μ N = μ*m*g*cosθ

where μ is static friction coefficient.

μ N is the maximum static friction force when the normal force equal N.

**Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.**This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

- Please feel free to post your ideas about how to use the simulation for better teaching and learning.
- Post questions to be asked to help students to think, to explore.
- Upload worksheets as attached files to share with more users.