FIGURE 4-12
-A 6.00-kg block is in contact with a 4.00-kg block on a frictionless surface as shown in Fig. 4-12. The 6.00-kg block is being pushed by a 20.0-N force toward the 4.00-kg block. What is the magnitude of the force of the 6.00-kg block on the 4.00-kg block?
A)6.00 N
B)12.0 N
C)8.00 N
D)4.00 N
E)10.0 N

Question

FIGURE 4-12 
-A 6.00-kg block is in contact with a 4.00-kg block on a frictionless surface as shown in Fig. 4-12. The 6.00-kg block is being pushed by a 20.0-N force toward the 4.00-kg block. What is the magnitude of the force of the 6.00-kg block on the 4.00-kg block?
A)6.00 N 
B)12.0 N 
C)8.00 N 
D)4.00 N 
E)10.0 N

Quizplus · Accepted Answer

According to Newton's third law, the force of the 6.00-kg block on the 4.00-kg block is equal in magnitude but opposite in direction to the force of the 4.00-kg block on the 6.00-kg block. The force of the 4.00-kg block on the 6.00-kg block is 8.00 N, so the force of the 6.00-kg block on the 4.00-kg block is also 8.00 N.

FIGURE 4-12 -A 6.00-Kg Block Is in Contact with a 4.00-Kg Block