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# Dynamics Final

### Final Study Cards for Dynamics

Question | Answer |
---|---|

What is the difference between the kinematics of a particle and the kinetics of a particle? | Kinematics is the study of the geometry of a particle in motion. Kinetics is the study of this particle including forces, mass and motion. |

Consider a particle in rectilinear motion with its position given by the expression x= 2t^4 + 4t^3 + 5 with x in meters and t in seconds. Find the acceleration, velocity, and position of the particle at t= 3 seconds. | x(3)= 275m , v(3)= 324m/s, a(3)= 288m/s^2 |

For a particle in planar, curvilinear motion, how are the normal and tangental directions defined? | The normal direction would be the direction perpendicular to the curve toward the center of curvature. The tangental direction would be the direction parallel to the curve at any time t. |

In the analysis of planar, curvilinear motion, what are the radial and transverse coordinates? | Transverse point in the direction in which P would move if * were increased and r were kept constant.(e*) Radial point in the direction in which P would move if r were increased and * were kept constant. (e r) |

If a particle is traveling in a curve path, which of the following statements must be true about its normal accelerations.a) it is zerob)it is directed toward the center of curvature of the path | c)it is directed away from the center of curvature of the pathd)any of the above may be true-b- |

If particles A and B have velocity vectors Va= 4i + 3j and Vb= 5i - 2j, find the relative velocity vector Va/b | Vb-Va= i-5j |

While watching a figure skating competition, it is observed that a skater begins a spin with her arms extended and then pulls them in toward her body.As she pulls in, the rate of spin increases.What principle of dynamics explains this phenomenon? | conservation of angular momentum |