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MMLU / A 1-kg object is released from rest at the top of a rough-surfaced incline. The…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A 1-kg object is released from rest at the top of a rough-surfaced incline. The object slides without rotating to the bottom of the incline. The object’s kinetic energy at the bottom must be

choices

  1. Equal to the block’s gravitational potential energy when it was released, because total mechanical energy must be conserved.
  2. Equal to the block’s gravitational potential energy when it was released, because the gain in kinetic energy compensates for the mechanical energy lost to thermal energy on the rough incline.
  3. Less than the block’s gravitational potential energy when it was released, because the gravitational potential energy was converted both to thermal energy and to kinetic energy.
  4. Less than the block’s gravitational potential energy when it was released, because the work done by the friction force must be greater than the block’s gain in kinetic energy.

subject

high_school_physics

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Source and history

task_id
0bfc60f3-a65c-5830-9509-2103ae075930
task_key
all--test--0bfc60f3-a65c-5830-9509-2103ae075930
task_revision_id
1
config / split
all / test

Official source

initial import