Physics 12  Mid-Year Review


 

12. A uniform 42 kg ladder leans against a frictionless wall as shown below. The ladder is 3.8 m  long. A 52 kg girl stands 3.0 m up the ladder.

  Solution

   

 

 

 

 

 

 

 

 

a) Draw a free-body diagram for the ladder and label the forces.(2 marks)

 

 

 

 

 

b) What minimum coefficient of friction between the ground and the ladder will prevent the ladder from slipping? (8 marks)