Question

A flat horizontal plane is raised until a block resting on its surface just slides down the plane at a constant rate. Identify the correct statement?
I. The parallel force equals the frictional force.
II. The weight of the object equals the frictional force.
III. The perpendicular force equals the normal force

• A. I only
• B. II only
• C. I and III only
• D. II and III only
• E. I, II, and III

Answer 1

The correct option is A I only

Weight cannot be equal to the frictional force. Perpendicular force is zero as there is no acceleration in that direction. The block just starts to move so the parallel force is equal to friction force.