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### 67 Cards in this Set

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 Newton's First Law aka Law of Inertia. A body at rest or in uniform Motion will remain at rest or in uniform motion unless some external force is applied to it. Inertia The body's reluctance to change whatever its doing (this remaining stationary). Also characterized as the "laziness of an object". Mass Quantity of matter of which a body is made or composed. It is a quatitative measure of body's inertia Unit of Mass In kilograms (kg) or grams (g) in the metric and slugs int he English system Newton's Second Law When a body acted upon by a constant force, its relucting acceleration is proportional to the force applied and inversely proportional to the mass and the acceleration takes place in direction in which the force acts. Newton's Third Law To every action, there is an equal and opposite reaction. When a body is at rest or in motion, the state of the body depends upon the reaction forces acting on it and not upon the action forces the body exerts on their bodies. Pound a force when applied to a mass of 1 slug. It will produce an acceleration of 1ft/s2. Newton a force when applied to a mass of 1kg it will produce an acceleration of 1m/s2. Weight weight and force have both magnitude and direction and are thus vector quantities. Mass Mass is a scalar quantity because it has magnitude only. Newton's 4th Law aka Law of Universal Gravitational. any two bodies attract each other with a force proportional to the product of their masses and universely proportional to the square of the distance between them. Work force times the distance through the force acts w = f x d Mass ENGLISH slugs (s) Mass METRIC kilogram (kg) Acceleration ENGLISH ft/s2 Acceleration METRIC m/s Force ENGLISH slugft/s2 (pound) Force METRIC kgm/s2 (Newton) Work ENGLISH ftlb Work METRIC mN or (Joules) Power ENGLISH ftlb/s Power METRIC mN/s or (Joules) Potential Energy ENGLISH ftlb Potential Energy METRIC mN or Joules Kinetic Energy ENGLISH ftlb Kinetic Energy METRIC mN or (Joules) Power the rate at which work is being done or time rate of performing work Power (equations) power = work/time power = (f x d)/time power = f (d/t) power = f x v Energy the capacity to do work 6 Forms of Energy 1. Chemical 2. Electric 3. Heat 4. Light 5. Mechanic 6. Nuclear Torque Torque is necessary to produce angular acceleration as force is required to cause linear acceleration (f = ma) Torque Is produced when when a force is applied off-center to the axis of rotation. Thus causes a rotation of the body Torque The magnitude is determined by the applied force and the length of the force arm Force Arm The perpendicular distance or the shortest distance from the axis of rotation to the line of action of the force Torque (L) = Force (F) x Force Arm (dI) Properties of Torque 1. magnitude of how much turning effect 2.Direction of turning effect 3. Point of Force Application-the point at which the force is being applied to the system. 4. Line of Action Force-the line in which the force is being applied it extends in either direction and provides a reference line for determining the length of the force arm Torque The larger thr force applied or the longer the force arm or both the greater the torque produced. Force For two equal forces applied to a body, the force that has the longer force arm produces the greater torque Speed ENGLISH ft/s Speed METRIC m/s Speed FORMULA s = l/t Velocity ENGLISH ft/s Velocity METRIC m/s Velocity FORMULA v = d/t Acceleration ENGLISH ft/s2 Acceleration METRIC m/s2 Acceleration FORMULA a = (vf-vi)/(tf-ti) Mass ENLGISH slug Mass METRIC kilogram (kg) Force ENLGISH slugft/s2 (pound) Force METRIC kgm/s2 (N) Force FORMULA f = ma Weight ENGLISH slugft/s2 (pound) Weight METRIC kgm/s2 (N) Weight FORMULA Fg = mg Power ENGLISH ftlb/s Power METRIC mN/s (J/s or Watt) Power FORMULA p = f(d/t) or f(v) Potential Energy ENGLISH ftlb Potential Energy METRIC mN (Joule) Potential Energy FORMULA PE = mgh or Wh Kinetic Energy ENGLISH ftlb Kinetic Energy METRIC mN (Joule) Kinetic Energy FORMULA KE = 1/2 mv2 Torque ENGLISH lbft Torque METRIC Nm (Joule) Torque FORMULA L = f(DI)