| A | B |
|---|
| mass | measure of the quantity of matter in an object |
| inertia | property of matter that opposes any change in its state of motion |
| matter | anything that has the properties of mass and enertia |
| energy | capacity to do work; the concept that unifies physics |
| potential energy | energy that is the result of the position of the object |
| kinetic energy | energy possessed by an object because of its motion |
| meter (m) | measure of length in MKS |
| kilogram (kg) | measure of mass in MKS |
| second (s) | measure of time in MKS and FPS |
| foot (ft) | measure of lenght in FPS |
| pound (lb) | measure of weight in FPS |
| milli- | metric system prefix meaning 10 ^ -3 |
| centi- | metric system prefix meaning 10 ^ -2 |
| kilo- | metric system prefix meaning 10 ^ 3 |
| accuracy | the closeness of a measurement to the accepted value for a specific physical quantity |
| precision | the agreement among several measurements that have been made in the same way |
| significant figures | those digits in a number that are known with certainty plus the first digit that is uncertain |
| scalar quantities | quantities that can be expressed completely by magnitude alone |
| vector quantities | quantities that require magnitutde and direction for their complete description |
| component vector | two or more vectors that produce the same effect as a sigal vector |
| resultant vector | a single vector that produces the same results as two or more vectors |
| displacement | change of position in a particular direction (m) |
| motion | the displacement of an object in a relation to objects that are considered to be stationary AKA relative displacement |
| speed | the time rate of motion (m/s) |
| velocity | speed in a particular direction (m/s in a direction) |
| velocity equation | total displacement/total time |
| acceleration | the time rate of change of velocity (m/s^2) |
| average acceleration equation | change in velocity/interval of time |
| force | a physical quantity that can affect the motion of an object (nt) |
| Newton's First Law of Motion (Law of Inertia) | unless a net force acts on an object, the motion of an object (or lack of it) does not change |
| Newton's Second Law of Motion(Law of Acceleration) | The effect of an applied force is to cause the body to accelerate in the direction of the force. The acceleration is in directo proportion to the force and in inverse proportion to the mass of the body |
| force equation | F = ma |
| Newton's Third Law of Motion (Law of Interaction) | when one body exerts a force on another, the second body exerts on the first a force of equal magnitude in the opposite direction |
| Law of Universal Gravitation | Fg=(Gravitational Constant)(Mass 1)(Mass 2)/(distance ^ 2) |
| concurrent forces | when two or more forces act on the same point at the same time |
| resultant force | a single force that has the same effect as two or more concurrent forces |
| equilibrium | the state of a body in which there is no change in its motion |
| First condition of equilibrium | there are no unblanced (net) forces acting on the body |
| equilibriant force | the single force that if applied at a point would produce equilibrium |
| friction | a force that resistions motion when objects are in contact with each other |
| conefficient of sliding friction | the ration of the force of sliding friction to the normal (perpendicular) force presing the two surfaces together (u = Ff/Fn) |
| parallel forces | forces that act in the same or opposite directions at different points on an object |
| center of gravity | the point of any object at which all of its weight can be considered to be concentrated |
| torque (T) | the product of a force and the length of its torque arm |
| Second condition of equilibrium | in a given plane the sum of all clockwise torques equals the sum of all the counter clockwise torques about any pivot point |
