Patricia stands on a hill at an angle of 30 degrees. there is enough friction to stop her from sliding down the hill. Which free
-body diagram shows the forces acting on her?
1 answer:
Correct free-body diagram is option A)
Explanation:
There are three forces acting on Patricia:
- Her weight, which is the force of gravitational attraction exerted by the Earth on her, whose magnitude is
(where m= mass and g= acceleration of gravity). The direction of this force is vertically downward.
- The normal force, exerted by the plane on Patricia, which acts always up perpendicular to the plane
- The force of friction, which prevents Patricia from sliding. The force of static friction acts in the direction opposite to the direction of motion if the body is let moving: so here, the force of friction acts up along the plane (parallel to the plane)
Therefore, the correct choice here is option A), because:
- The weight acts vertically downward
- The normal force acts perpendicular to the plane
- The force of friction acts parallel to the plane
Learn more about forces:
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