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A2L Item 131

Meta-Information
Description: 
Specify the motion of a block on an incline given that a block of half the mass moves with constant speed.
Goal: 
Reasoning with dynamics
Level: 
High School
Level: 
Undergraduate
Keywords: 
Dynamics
Keywords: 
Forces
Keywords: 
Friction
Keywords: 
Mechanics
Keywords: 
Reasoning
Source: 
UMPERG-ctqpe30

A block of mass m, when placed on a rough inclined plane and moved, moves down the plane with constant speed. If a block of mass 2m were placed on the same incline and moved, it would …

  1. return to rest.
  2. accelerate until the speed is half.
  3. move with some constant speed.
  4. None of the above.
  5. Cannot be determined
Commentary

Answer

The block will have the same motion. Both the gravitational force and the friction force scale with the mass so there is no net force in either case.