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9 Forces and their effects

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Question 45
H

A worker pushes two boxes, A and B, across a horizontal floor.

Box A is in contact with box B. The worker pushes box A with a horizontal force of 120 N.

The mass of box A is 20 kg and the mass of box B is 10 kg.

The frictional force on box A is 40 N and the frictional force on box B is 20 N.

a.

Calculate the resultant force on the system of both boxes.

[2]
b.

Calculate the acceleration of the boxes.

[2]
c.

Calculate the force that box A exerts on box B.

[3]
d.

Explain why the force that box B exerts on box A is not included in (a), but must be included in a free body force diagram for box A.

[2]
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9 Forces and their effects Questions

  1. GCSE
  2. /Physics
  3. /9 Forces and their effects

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