Forces in Connected Objects (Systems) Video Lessons

Video Thumbnail

Concept

Problem: The 10 kg block in the figure is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of the 2.0 kg block is μk = 0.38. Part A. What is the tension in the rope holding the 1.0 kg block to the wall? Part B. What is the acceleration of the 2.0 kg block?

FREE Expert Solution

Part A

Let:

  • The friction between the two blocks be Ff1
  • The friction between the large block and the ground be Ff2
  • The small mass be m1
  • The large mass be m2

Taking the sum of forces in the y-direction:

T - Ff1 = 0

T1 = Ff1

But Ff1 = N1μk 

98% (297 ratings)
View Complete Written Solution
Problem Details

The 10 kg block in the figure is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic friction at both the lower and upper surfaces of the 2.0 kg block is μk = 0.38. 

Part A. What is the tension in the rope holding the 1.0 kg block to the wall? 

Part B. What is the acceleration of the 2.0 kg block?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Forces in Connected Objects (Systems) concept. You can view video lessons to learn Forces in Connected Objects (Systems). Or if you need more Forces in Connected Objects (Systems) practice, you can also practice Forces in Connected Objects (Systems) practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Stevens' class at UMASS.