Kinetic and static friction help please!

  • #1
A box of textbooks of mass 24.5 kg rests on a loading ramp that makes an angle alpha with the horizontal. The coefficient of kinetic friction is 0.270 and the coefficient of static friction is 0.330.

As the angle alpha is increased, find the minimum angle at which the box starts to slip.

At this angle, find the acceleration once the box has begun to move.

At this angle, how fast will the box be moving after it has slid a distance 4.70 m along the loading ramp?




please help me. i dont even know what to do or where to start. Thanks! :)
 

Answers and Replies

  • #2
lightgrav
Homework Helper
1,248
30
Start with Forces ... remember, they are vectors.
 

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