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CG PET Work and Energy — practice questions — page 4

Explore 102 free Work and Energy questions in CG PET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Work and Energy questions and exercises with answers

Showing questions 91–102 of 102.

Speeds up, slows down, or neither?Read the answer and worked solution →Applying the work-energy theoremRead the answer and worked solution →True or false: potential energyRead the answer and worked solution →Kinetic or potential?Read the answer and worked solution →Tap every statement true of a closed pathRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: energyRead the answer and worked solution →Complete the potential energy relationRead the answer and worked solution →Flip and pair: quantity with what it tracksRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Order the reasoning: why a pendulum keeps swingingRead the answer and worked solution →Conservative or not, in practiceRead the answer and worked solution →

Worked practice questions

Speeds up, slows down, or neither?

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Items
  1. Item
    Positive net work
    Category
    Speeds up
  2. Item
    Negative net work
    Category
    Slows down
  3. Item
    Zero net work
    Category
    Speed unchanged
  4. Item
    Forces that cancel out
    Category
    Speed unchanged
Categories
  1. Item
    Speeds up
  2. Item
    Slows down
  3. Item
    Speed unchanged
The sign of the net work decides it. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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Applying the work-energy theorem

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Questions
  1. Question
    If net work on a body is positive, its kinetic energy
    Choices
    1. falls
    2. rises
    3. is unchanged
    Correct choice
    rises
  2. Question
    If a body's speed is constant, the net work on it is
    Choices
    1. positive
    2. negative
    3. zero
    Correct choice
    zero
  3. Question
    Kf minus Ki equals
    Choices
    1. the net work
    2. the force
    3. the displacement
    Correct choice
    the net work
  4. Question
    A braking car has net work that is
    Choices
    1. positive
    2. negative
    3. zero
    Correct choice
    negative
Net work in, kinetic energy out. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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True or false: potential energy

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Questions
  1. Statement is true
    Yes
    Statement
    A potential energy function exists for a conservative force.
  2. Statement is true
    Yes
    Statement
    The force is the negative rate of change of that potential.
  3. Statement is true
    No
    Statement
    A potential energy can be defined for friction.
  4. Statement is true
    Yes
    Statement
    Potential energy depends on position.
  5. Statement is true
    No
    Statement
    Potential energy depends on the route taken to get there.
It is defined only for a conservative force, from its work. Source: syllabus Physics, Ch 5 Work, Energy and Power.

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