Engineering Board Exam Reviewer · Engineering Mechanics · hard
For a ladder leaning against a smooth (frictionless) wall and resting on a rough floor, the free-body diagram of the ladder should include:
- Only normal forces from both the wall and floor
- A friction force from the wall and a normal force from the floor
- A normal force from the wall (horizontal), and both a normal force and friction force from the floor
- Only friction forces from both surfaces
Answer
C. A normal force from the wall (horizontal), and both a normal force and friction force from the floor
Solution
Since the wall is smooth, it exerts only a normal (perpendicular) force; the rough floor exerts both a normal force and a friction force to prevent slipping.
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