Question
Question: A force applied to a 50 kg box on a level floor is just enough to start it moving. The coefficients ...
A force applied to a 50 kg box on a level floor is just enough to start it moving. The coefficients of static and kinetic friction are, respectively, 0.5 and 0.3. If the same force continues to be applied to the box, it will have an acceleration of approximately (g = 10 m/s2)
A
2 m/s2
B
4 m/s2
C
4 m/s2
D
5 m/s2
Answer
2 m/s2
Explanation
Solution
Force required to move box F > 250 N
Minimum force needed = 0.5 × 50 × 10 = 250 N
250 N – 150 N = ma ̃ a = 2m/s2