
Concept explainers
Part (a)
The horizontal force required to move the crate at a steady speed across the floor.
Part (a)

Answer to Problem 34P
Solution:
64.7 N
Explanation of Solution
Given:
Mass of the crate,
Coefficient of kinetic friction,
Formula used:
Frictional force F is obtained by:
Where,
The normal force would be equal to the weight of the crate.
Where F is the force acting, m is the mass, g is the acceleration due to gravity,
Calculation:
The crate is required to be moved at steady speed which means acceleration is zero. The required horizontal force would be just equal to the kinetic frictional force.
Conclusion:
The horizontal force is 64.7 N.
Part (b)
The horizontal force if
Part (b)

Answer to Problem 34P
Solution:
0 N
Explanation of Solution
Given:
Mass of the crate,
Coefficient of kinetic friction,
Formula used:
Frictional force F is obtained by:
Where,
The normal force would be equal to the weight of the crate.
Where F is the force acting, m is the mass, g is the acceleration due to gravity,
Calculation:
The crate is required to be moved at steady speed which means acceleration is zero. The required horizontal force would be just equal to the kinetic frictional force.
Conclusion:
Therefore, the force required to move the crate on a frictionless surface is zero.
Chapter 4 Solutions
Physics: Principles with Applications
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