Motion
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Questions and Answers

What is the definition of energy in physics?

  • The capacity to cause change in an object (correct)
  • The ability to perform work on an object
  • The ability to increase the mass of an object
  • The ability to transfer heat to an object

    • What is the law of conservation of energy?

  • The total energy of an isolated system cannot change (correct)
  • Energy can be created and destroyed
  • Energy can be transferred but not changed
  • Energy can only be changed but not transferred

    • What is the equation that expresses the first law of thermodynamics for a closed system?

  • E1 + E2 = Q – W
  • E2 - E1 = Q + W
  • E2 - E1 = Q – W (correct)
  • E1 + E2 = Q + W

    • What is the internal energy (E) equal to?

    <p>The difference of the heat transfer and the work done</p> Signup and view all the answers

    What is the physical property that must be transferred to an object to perform work on it?

    <p>Energy</p> Signup and view all the answers

    What is the characteristic of energy that makes it a conserved quantity?

    <p>It can change form but not amount</p> Signup and view all the answers

    What is displacement in linear motion?

    <p>The vector difference between the ending and starting positions of an object.</p> Signup and view all the answers

    What is the formula for average velocity?

    <p>Vav = ∆x / ∆t</p> Signup and view all the answers

    What is the instantaneous velocity of an object?

    <p>The velocity of an object at a specific point in time.</p> Signup and view all the answers

    What is the difference between average velocity and average speed?

    <p>Average velocity is a vector, while average speed is a scalar.</p> Signup and view all the answers

    What is the unit of average velocity?

    <p>Meter per second</p> Signup and view all the answers

    What is the name of the type of motion a pendulum exhibits when released?

    <p>Simple harmonic motion</p> Signup and view all the answers

    What is the period of a pendulum dependent on?

    <p>Both the length of the pendulum and the amplitude of the pendulum's swing</p> Signup and view all the answers

    What is the frequency of a pendulum related to?

    <p>The number of times the pendulum swings back and forth per second</p> Signup and view all the answers

    What is the equation that relates the period of a pendulum to its length and gravitational acceleration?

    <p>T = 2π√(l/g)</p> Signup and view all the answers

    What is the purpose of a centrifuge in a laboratory?

    <p>To separate fluids, gas, or liquid based on density</p> Signup and view all the answers

    What is the principle behind the operation of a centrifuge?

    <p>Sedimentation principle</p> Signup and view all the answers

    What happens to objects that are less dense in a centrifuge?

    <p>They move to the center of the tube</p> Signup and view all the answers

    What is the force that retards a sphere moving through a viscous fluid proportional to?

    <p>The velocity of the sphere, the radius of the sphere, and the viscosity of the fluid</p> Signup and view all the answers

    What are the units of Fd in Stokes' law?

    <p>N</p> Signup and view all the answers

    What is the role of the buoyant force in Stokes' law?

    <p>It is in equilibrium with the difference between the download gravitational force and upward buoyant force</p> Signup and view all the answers

    What is the symbol for the viscosity of the fluid in Stokes' law?

    <p>η</p> Signup and view all the answers

    What is the direction of the frictional force (Fd) acting on the interface between the fluid and the particle?

    <p>Opposite to the direction of motion</p> Signup and view all the answers

    What is the direction of the buoyant force relative to the external force?

    <p>Parallel to the external force but in the opposite direction</p> Signup and view all the answers

    What is the purpose of a centrifuge in relation to gravity?

    <p>To increase the acceleration due to gravity</p> Signup and view all the answers

    What is the retarding force acting on a particle moving in a fluid due to?

    <p>Frictional resistance</p> Signup and view all the answers

    What are the three forces that act on a rigid particle moving in a fluid?

    <p>External force, buoyant force, and drag force</p> Signup and view all the answers

    What is the drag force exerted by a fluid on a solid?

    <p>A force in the direction of the fluid flow</p> Signup and view all the answers

    What do Newton's laws of motion describe?

    <p>The relationship between a body and the forces acting upon it</p> Signup and view all the answers

    The unit of force is Kg.m/s²

    <p>True</p> Signup and view all the answers

    Momentum is a scalar quantity

    <p>False</p> Signup and view all the answers

    Impulse is equal to the change in momentum

    <p>True</p> Signup and view all the answers

    The gravitational force between two objects is inversely proportional to the square of the distance between them

    <p>True</p> Signup and view all the answers

    A net force of 0 Newtons acting on an object means it is accelerating

    <p>False</p> Signup and view all the answers

    The weight of an object is the same as its mass

    <p>False</p> Signup and view all the answers

    The acceleration of an object is directly proportional to the net force acting on it

    <p>True</p> Signup and view all the answers

    The unit of momentum is Kg.m/s

    <p>True</p> Signup and view all the answers

    The force of gravity is a contact force

    <p>False</p> Signup and view all the answers

    The mass of an object is 1 kg, its weight is also 1 N

    <p>True</p> Signup and view all the answers

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