The 850 kg piano is being pushed across the floor with an applied force of 283 N [forward] and a force of friction of 271 N [backwards]. If the normal force balances the force of gravity, draw a free body diagram for the piano.

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To draw a free body diagram for the piano, we need to represent the forces acting on it. Here is how you can do it:

1. Start by drawing a rough outline of the piano as a rectangular shape.
2. Add an arrow pointing downwards from the center of the rectangle to represent the force of gravity acting on the piano. Label it as "mg" (mass x gravity).
3. Draw another arrow pointing upwards from the center of the rectangle to represent the normal force (N). Since the normal force balances the force of gravity, label it as "mg."
4. Add an arrow pointing to the right from the center of the rectangle to represent the applied force (F_app). Label this arrow as "F_app."
5. Finally, draw an arrow pointing to the left from the center of the rectangle to represent the force of friction (F_friction). Label this arrow as "F_friction."

The free body diagram for the piano should have the following components:
- An arrow pointing downwards labeled as "mg" (representing the force of gravity).
- An arrow pointing upwards labeled as "mg" (representing the normal force).
- An arrow pointing to the right labeled as "F_app" (representing the applied force).
- An arrow pointing to the left labeled as "F_friction" (representing the force of friction).

Remember, the lengths of the arrows don't necessarily represent the magnitude or scale of the forces; they are only meant to show the direction of the forces.