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AP Physics 1 Unit 3B: Potential Energy & Conservation of Energy — practice questions — page 2

Explore 92 free Unit 3B: Potential Energy & Conservation of Energy questions in AP Physics 1 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 3B: Potential Energy & Conservation of Energy questions and exercises with answers

Showing questions 31–60 of 92.

Objects falling toward Earth are never truly in free-fall in the real world because:Read the answer and worked solution →How many basic forces are now taken to account for all known phenomena?Read the answer and worked solution →Which of Newton's laws is it?Read the answer and worked solution →Mass or weight?Read the answer and worked solution →True or false: forces and motionRead the answer and worked solution →Work the force numbersRead the answer and worked solution →Complete Newton's lawsRead the answer and worked solution →Angular acceleration is defined as the rate of change of:Read the answer and worked solution →Linear acceleration in circular motion, which changes the size of the velocity, is called:Read the answer and worked solution →Centripetal acceleration changes which aspect of the velocity?Read the answer and worked solution →The rotational analogue of force in Newton's second law is:Read the answer and worked solution →The rotational analogue of mass is called the:Read the answer and worked solution →Torque depends on force magnitude, point of application and:Read the answer and worked solution →The moment of inertia of a hoop about its axis is its total mass multiplied by:Read the answer and worked solution →The moment of inertia of an object depends on which choice made by the observer?Read the answer and worked solution →In rotational motion, the cause of angular acceleration is:Read the answer and worked solution →The total moment of inertia of a merry-go-round with a child on it is found by:Read the answer and worked solution →Rotational kinematics relates to translational kinematics in what way?Read the answer and worked solution →Converting an angular velocity from revolutions per minute to standard units means converting to:Read the answer and worked solution →A bicycle turned upside down and spun does not travel, but on its wheels the same angular acceleration would first produce:Read the answer and worked solution →A helicopter's engine cannot both lift the craft and quickly restore the blades' rotational kinetic energy because of:Read the answer and worked solution →A flywheel on a bus is useful because its stored energy can be used to:Read the answer and worked solution →Adding a child at the rim of a merry-go-round changes the angular acceleration because it changes the:Read the answer and worked solution →Match rotational to translationalRead the answer and worked solution →Tangential or centripetal?Read the answer and worked solution →True or false: rotationRead the answer and worked solution →Complete the rotational second lawRead the answer and worked solution →Which quantity is it?Read the answer and worked solution →The time to complete one full oscillation is called the:Read the answer and worked solution →The SI unit for frequency, one cycle per second, is the:Read the answer and worked solution →

Worked practice questions

Objects falling toward Earth are never truly in free-fall in the real world because:

  1. Their mass decreases
  2. Earth moves away
  3. Air pushes upward
  4. Gravity switches off
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Correct answer: C. Air pushes upward

1. Free-fall in the strict sense means gravity is the only force acting. 2. In practice something else is always present. 3. In the real world, when objects fall downward toward Earth, they are never truly in free-fall because there is always some upward force from the air acting on the object. 4. That upward force is air resistance, or drag. 5. Only in a vacuum does the strict free-fall condition hold. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_

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How many basic forces are now taken to account for all known phenomena?

  1. Two forces
  2. Three forces
  3. Six forces
  4. Four forces
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Correct answer: D. Four forces

1. Physics has repeatedly unified apparently separate forces. 2. The development of special relativity and empirical observations at atomic scales pushed that programme further. 3. They led to the idea that there are four basic forces that account for all known phenomena. 4. These forces are called fundamental. 5. Gravity, electromagnetism and the two nuclear forces make up that set of four. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_

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Which of Newton's laws is it?

Read exercise and reference answers
Items
  1. Item
    Inertia keeps it
    Category
    First law
  2. Item
    No force, no shift
    Category
    First law
  3. Item
    Force equals ma
    Category
    Second law
  4. Item
    More mass, less a
    Category
    Second law
  5. Item
    Equal and opposite
    Category
    Third law
  6. Item
    Forces come paired
    Category
    Third law
Categories
  1. Item
    First law
  2. Item
    Second law
  3. Item
    Third law
Instructions
Tap a statement, then tap the law it belongs to.
_Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_

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Unit 8: Fluids: Density, Buoyancy and ContinuityUnit 1B: Kinematics: 2D Motion & ProjectilesUnit 1C: Kinematics: Relative & Circular MotionUnit 2A: Newton's Laws and Translational EquilibriumUnit 2B: Friction, Gravitational and Normal ForcesUnit 3A: Work and Kinetic Energy TheoremUnit 4A: Linear Momentum and ImpulseUnit 4B: Conservation of Linear Momentum & Collisions