5 Written Questions
5 Matching Questions
- Centrifugal ("Center-Fleeing") Force
- Stick about end:
- Center of mass (CM)
- axis (pl. axes)
- center of mass
- a Point at the center of an objects mass distribution, where all its mass can be considered to be concentrated. For everday conditions, it is the same as the center of gravity.
- b I = 1/3 mL²
- c (a) Straight line about which rotation takes place.
(b) Straight lines for reference in a graph, usually the x-axis for measuring horizontal displacement and the y-axis for measuring vertical displacement.
- d 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.
- e The average position of the mass of an object. The CM moves as if all the external forces acted at this point.
5 Multiple Choice Questions
- L = Iω
where L (angular momentum) translates to linear momentum (p), and I (moment of inertia) translates to mass (m), and ω (angular velocity) translates to velocity (v). This is the translation from rotational (circular world) terms to linear terms (linear world).
- the tendency of a force to rotate an object about an axis (force x lever arm)
- the straight line around which rotation occurs
- the amount of time it takes to complete one cycle (1 revolution)
- In the absence of a net external force, the momentum of an object or system of objects is unchanged.
5 True/False Questions
rotational inertia → Number of rotations or revolutions per unit of time.
Equilibrium → In general, a state of balance. For mechanical equilibrium, the state in which no net forces and no net torques act.
Rotational Inertia → Number of rotations or revolutions per unit of time.
machine → the straight line around which rotation occurs
Pendulum → Inertia in motion. The product of the mass & velocity of an object (provided the speed is much less than the speed of light) has magnitude & direction & therefore is a vector quantity. Also called linear momentum & abbrieviated p=mv