Question

A brick of mass has been placed on a rubber cushion of mass . Together they are sliding to the right at constant velocity on an ice-covered parking lot.  (a) Draw a free-body diagram of the brick and identify each force acting on it. (b) Draw a free-body diagram of the cushion and identify each force acting on it.  (c) Identify all of the action reaction pairs of forces in the brickcushionplanet system.

Hard

Solution

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The free-body diagrams are shown below.
(a) 
    = normal force of cushion on brick.
    = gravitational force on brick
(b)
    = normal force of pavement on cushion
    = gravitational force on cushion
    = force of brick on cushion
(c)
   force: normal force of cushion on brick reaction force:
   force of brick on cushion
   force: gravitational force of Earth on brick reaction.
   force: gravitational force of brick on Earth.
   force: normal force of pavement on cushion reaction.
   force: force of cushion on pavement
   force: gravitational force of Earth on cushion reaction.
   force: gravitational force of cushion on Earth.

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