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# Level 6 Mechanics

### 2015 Yr 10 Kinetics

Term | Definition |
---|---|

Year 10 Kinetics Glossary Level 6. | |

Air resistance | A force due to friction with the air, which pushes against a moving object, e.g air resistance slows down a parachute. |

Average velocity | The time |

Buoyancy | the upward force exerted, the ability of a fluid to exert an upward force on a body placed in it |

Centripetal Acceleration | The acceleration, directed toward the center of a circle, which causes uniform circular motion. |

Centripetal Force | The force, directed toward the center of a circle, which causes uniform circular motion. |

Collision | The brief direct contact between two bodies that results in a net impulse on each body. |

Completely Inelastic Collision | Any collision in which the two bodies stick together. |

Direction | The direction in which a 2D |

Displacement | An objects total change in position. If a man runs around an oval 400 meter track, stopping at the precise location he began, though he ran a distance of 400 meters, his total displacement was 0. |

Distance | Distance = Speed X Time |

DT graphs | Distance time graphs. |

Dynamics | Dynamics focuses on understanding why objects move the way they do. |

Effort | working force in a balance |

Elastic Collision | Any collision in which kinetic energy is conserved. |

Energy | The ability to do work. |

Force | A force is defined as a push or a pull. |

Free Body Diagram | A diagram of all forces acting upon a given object. |

Friction . | A force when two surfaces rub together. Friction acts against movement |

Fulcrum | balance point |

Gravitational acceleration | The gravitational acceleration of objects near the earth's surface is the same for all objects regardless of mass and is given by the number g = 9.8m/s2 . |

Gravity | A force of attraction between two objects. The pull of gravity on you is your weight. |

in equilibrium’. | |

Inelastic Collision | Any collision in which kinetic energy is not conserved. |

Inertia | The tendency of an object to remain at constant velocity. |

Instantaneous velocity | The value of the velocity function at a particular instant in time. (See formula below.) |

Joule | The units of work, equivalent to a Newton |

Kinematics | Kinematics is concerned with describing the way in which objects move. |

Kinetic Energy | The energy of motion. |

Kinetic Frictional Force | The frictional force on two bodies in motion relative to one another. |

Lever | a rigid bar used to exert a pressure or force at one point of its length by the application of a force at a second and turning at a third point called a fulcrum |

Load | – the weight or what needs to be moved |

Magnitude | The magnitude of a vector is its length, or distance from the origin. |

Mass | The amount of a material, measured in Kg. |

Mass | The amount of matter in a given body. |

Mechanics | 1: a branch of physical science that deals with energy and forces and their effect on bodies 2: the practical application of mechanics to the design, construction, or operation of machines or tools |

moment of a force | the product multiplying the force (F) and the moment arm (d). Moment =Force x Distance or M = (F)(d) The Center of Moments may be the actual point about which the force causes rotation, “center of gravity”. |

Newton | The name given to a unit of force. One Newton is enough force to cause a 1 Kg body to accelerate at a rate of one meter per second per second. The units used to measure force (N). |

Newton's Three Laws | First: If F = 0 then a = 0 and v = constant: Second:F = ma : Third Law: F AB = |

Normal Force | The force caused by two bodies in direct contact that is perpendicular to the plane of contact. |

Pivot | – balance point |

Power | Work done per unit time. For formulas, see Formula for average power, Definition of instantaneous power, and formula for instantaneous power. |

Scalar | An ordinary number; whereas vectors have direction and magnitude, scalars have only magnitude. 5 km represents a scalar. |

Speed | How fast an object is moving. Speed = Distance/Time |

ST graphs | Speed time graphs – you will need to collect data, interpret and discuss |

Static Frictional Force | The frictional force on two bodies at rest. |

steady speed | – constant speed |

Tension Force | The force felt by a rope or cable that transmits another force. |

Terminal speed | The constant speed of a falling object, where the force of gravity and the drag of air resistance are in balance. If it has direction = terminal velocity |

Time | Time = Distance/Speed |

Unit vector | A vector whose length is one. |

Upthrust | Upward force produced by an object in a liquid or a gas. |

Vector | A two-dimensional vector is an ordered pair (a, b) of numbers. In other words, points in the plane are vectors. These kinds of vectors can also be described as having direction and magnitude: 5 km to the east represents a vector. |

Velocity | The speed and direction of an object. |

Watt | Unit of power; equal to joule/second. |

Weight | The force of gravity on a mass. It is measured in newtons. |

Weightlessness | as F=ma if no gravity acceleration there is no weight force |

Work | A force applied over a distance. Work done by a constant force parallel to displacement W = Fx |