Eamcet Physics - 1 st Year : Unit 3.5( Laws of Motion ) - Block on Block Free Online Tests | Mock Tests | Preparation | Practice Tests

Study Room

Goto

Eamcet Physics
1 st Year : Unit 3.5( Laws of Motion ) - Block on Block

Take Exam

01 02 03 04 05 06 07 08 09 10

2 / 10

A 2kg block is placed over a 4kg block and both are placed on a smooth horizontal surface. The coefficient of friction between the blocks is 0.20. The acceleration of the two blocks if a horizontal force of 12N is applied to the upper block (g=10ms^–2)

A. 4 ms^–2, 2 ms^–2

B. 2 ms^–2, 2 ms^–2

C. 3 ms^–2, 3 ms^–2

D. 4 ms^–2, 1 ms^–2

E. None of the above

View Answer

Correct choice: D

Explanation:

For 2kg block
12 - μ mg = ma
12 - 0.2 (2) (10) = 2a
8 = 2a
a = 4 ms^–2
The 4 kg block moves towards right because of frictional force
f = 4a
0.2 (2) 10 = 4a
a = 1 ms^–2

2 / 10

Study Room

Lessons

Eamcet Physics 1 st Year : Unit 3.5( Laws of Motion ) - Block on Block

Eamcet Physics
1 st Year : Unit 3.5( Laws of Motion ) - Block on Block