http://www.ck12.org Chapter 4. Newton’s Laws
As you know, if the situation is left like this, the little block will just fall. But if we accelerate the leftmost
block to the right, this will create a normal force between the little block and the big block, and if there is a
coefficient of friction between them, then the little block won’t slide down! Clever, eh?
a. The mass of the little block is 0.15 kg. What frictional force is required to keep it from falling? (State a
magnitude and direction.)
b. If both blocks are accelerating to the right with an accelerationa= 14 .0 m/s^2 , what is the normal force
on the little block provided by the big block?
c. What is the minimum coefficient of static friction required?Answers
- b.Fx= 87 N,Fy= 50 Nc.N= 750 Nd. f= 60 Ne. 0. 34 m/s^2
- 0.5
- 0.2
- 0.33
- a. 1.5 N; 2.1 N; 0. 71