A ladder rests against a smooth wall. The wall exerts a force on the ladder that is
Correct answer: C. perpendicular to the wall
- A. along the ladder
- B. vertically upwards
- C. perpendicular to the wall
- D. parallel to the wall
Explanation
A smooth surface can exert no friction, so the only force it can apply is the normal reaction, which by definition acts at right angles to the surface. That makes the reaction from a vertical wall horizontal. The ground, being rough, supplies both a normal force and the friction that stops the ladder sliding out.
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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