Physics Chapter on Mechanics
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Questions and Answers

What is the definition of inertia?

  • The property of a body to remain in its current state unless acted upon by an external force. (correct)
  • A measurable physical quantity that describes resistance to motion.
  • The ability to change speed without any net force acting upon it.
  • A force that causes acceleration depending on the mass of an object.

    • Which equation best represents Newton's second law of motion?

  • F = ∫Fdt
  • F = dp/dt
  • F = m(v_f - v_i)
  • F = ma (correct)

    • When is an object said to be in static equilibrium?

  • When the sum of all forces acting on it is less than zero.
  • When it has a net force greater than zero.
  • When it is at rest or moving with constant velocity. (correct)
  • When it experiences acceleration.

    • What does the impulse-momentum theorem state?

    <p>Impulse is equal to the change in momentum of an object.</p> Signup and view all the answers

    How does Newton’s third law of motion describe forces?

    <p>For every action, there is an equal and opposite reaction.</p> Signup and view all the answers

    What does the conservation of momentum principle state?

    <p>For a closed system, the total amount of momentum remains constant if no external forces act on it.</p> Signup and view all the answers

    In the context of a spring force, what does the equation $f_{spring} = kx$ represent?

    <p>The restoring force is proportional to the displacement from the mean position.</p> Signup and view all the answers

    What is the significance of a free body diagram (F.B.D)?

    <p>It identifies and illustrates all the forces acting on a body.</p> Signup and view all the answers

    What is the relationship between the exhaust velocity and net force acting on a rocket during fuel consumption?

    <p>Fnet is affected by both the exhaust velocity and gravitational force.</p> Signup and view all the answers

    In a gun-bullet system, what condition leads to the recoil of the gun?

    <p>The conservation of momentum in the system.</p> Signup and view all the answers

    How does static friction differ from kinetic friction in terms of motion?

    <p>Static friction can adjust itself up to a limit before motion starts.</p> Signup and view all the answers

    What is the effect of gravitational acceleration on the normal force in a lift during free fall?

    <p>Normal force becomes zero during free fall.</p> Signup and view all the answers

    When calculating tension in a pulley system, what variable does not directly affect the tension experienced by the ropes in a balanced system?

    <p>The distance between the blocks.</p> Signup and view all the answers

    What happens to the net force when the combined force applied exceeds the total limiting friction in a two-block system?

    <p>The blocks will accelerate based on the excess force.</p> Signup and view all the answers

    In a block-over-block scenario, if the maximum acceleration $a_{max}$ is greater than the applied acceleration $a$, what occurs?

    <p>Both blocks will move with the same acceleration.</p> Signup and view all the answers

    Which of the following statements regarding pseudo forces is correct?

    <p>Pseudo forces act in non-inertial frames opposite to the direction of acceleration.</p> Signup and view all the answers

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