The Physics
Hypertextbook
Opus in profectus

Forces

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Practice

practice problem 1

Draw a free body diagram of…
  1. a book lying on a level table.
  2. a person floating in still water.
  3. a wrecking ball hanging vertically from a cable.
  4. a helicopter hovering in place.

solution

In all four cases, the downward pull of gravity is balanced by an upward force. There are no significant lateral (side-to-side) forces in these examples. Read the discussion section of this topic for a more detailed explanation.

       
book person wrecking ball helicopter

practice problem 2

Draw a free body diagram of a child pushing a wagon on level ground.

solution

The solution to this problem depends on the direction of the acceleration of the wagon. Read the discussion section of this topic for a more detailed explanation.

practice problem 3

Write something different.

solution

Answer it.

practice problem 4

Write something completely different.

solution

Answer it.