Intro to Forces + Newton's Laws Video Lessons

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Problem: A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake as shown in the figure. Gine the coefficient of static friction to be μs = 0.1, and the coefficient of kinetic friction to be μk = 0.03(a) Calculate the minimum force F he must exert to get the block moving. (b) What is the magnitude of its acceleration once it starts to move if that force is maintained? 

FREE Expert Solution

(a)

In the y-direction:

N = mg + Fsin25°

In the x-direction:

Fcos 25° = μsN

Substitute for N in the equation in the x-direction.

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Problem Details

A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake as shown in the figure. Gine the coefficient of static friction to be μ= 0.1, and the coefficient of kinetic friction to be μk = 0.03


(a) Calculate the minimum force F he must exert to get the block moving. 

(b) What is the magnitude of its acceleration once it starts to move if that force is maintained? 


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