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5 Written questions

5 Matching questions

  1. Stick about end:
  2. Pendulum
  3. Solid sphere about CG:
  4. Rotational speed (sometimes called angular speed)
  5. conservation of momentum
  1. a I = 1/3 mL²
  2. b I = 2/5 mr²
  3. c In the absence of a net external force, the momentum of an object or system of objects is unchanged.
  4. d an object hanging from a fixed point which, when pulled back and released, is free to swing back down by gravity and inertia
  5. e The number of rotations or revolutions per unit of time; often measured in rotations or revolutions per second or per minute. (Scientists usually measure it in radians per second.)

5 Multiple choice questions

  1. An object or system of objects will maintain its angular momentum unless acted upon by an external net torque.
  2. Product of force & the time interval during which the force acts. Impulse produces change in momentum Ft= change(mv)
  3. I = 1/12 mL²
  4. the amount of time it takes to complete one cycle (1 revolution)
  5. This force is not an actual force; it is a fictitious force that seems to pull outwards on an object on a circular path. This effect is due to inertia, or the tendency for a moving object to follow a straight path.

5 True/False questions

  1. Simulated GravityCentrifugal force can simulate gravity because from within a rotating frame of reference, there seems to be a centrifugal force directed outward.


  2. Rotate (spin)circular motion around an internal axis (e.g. the Earth rotates to cause a cycle of day and night)


  3. The rotational inertia of a pole, or of any object, depends on the axis about which it rotates.⁴⁴When the mass of an object is concentrated at the radius r from the axis of rotation (as for a simple pendulum bob or a thing ring), rotational inertia I is equal to the mass m multiplied by the square of the radial distance. For this special case, I = mr².


  4. kinetic energyPrinciple that energy cannot be created or destroyed. It may be transformed from one form to another, but the total amount of energy never changes.


  5. energyThat which that can be change the condition of matter. Comonly defined as the ability to do work; actually only describable by examples. It is not a materail substance.


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