For the object above of mass 3kg find The net force(magnitude and direction). Th

Question

For the object above of mass 3kg find The net force(magnitude and direction). The acceleration. How much tension must a rope withstand if it is used to accelerate a 1000kg car upward at 2m/s? Use Newton's second law. A 10kg mass is lowered by a rope. The tension in the rope is 80N. What is the acceleration of the mass? Use Newton's second law. If the coefficient of kinetic friction between a 30kg crate and the floor is 0.2,what force would be required to accelerate the crate at 2m/s^2 across the floor? What force would be needed to move the crate at steady speed across the floor?

Explanation / Answer

1) a Nett force is F3 + F2 - F1

= 26 newtons direction will be towards right

b force= mass * acc

26 = 3 * acc acc= 26/3= 8.66 m/s2

2) F = M* a

tension is F = 1000 * 2= 2000 newtons

3) similarly 80 = 10* acc

acc= 80/10 = 8 m/s2

4 a) force reqd to overcome weight + friction

4 b) staedy speed will be to overcome friction which is 0.2 * 30* 9.8 = 58.8 N

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