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### 29 Cards in this Set

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 length meter [m] measurement of space direction time second [s] continuous forward flowing of events mass kilogram [kg] amount of matter electric current Ampere [A] property of matter temperature Kelvin [K] intensity of light Candela [cd] Speed Object travels divided by the time it takes to travel that distance. Speed(in m/s) = distance (in m) / time (in s) s = d / t Velocity has the same numerical value as speed but velocity always includes information on the direction of travel. The speed of a car may be 50 km per hour, while the velocity is 50 km per hour due west. This means velocity has a magnitude and a direction. Acceleration is the amount of change in velocity divided by the time it takes the change to occur. acceleration( in m/s2)= [final velocity - initial velocity (in m/s)] / time ( in s) a = (vf - vi) / t The First Law: An object in motion stays in motion until acted on by a force. The Second Law: The greater the force, the greater the acceleration; but the more massive the object being acted or by a given force, the smaller the acceleration. The Third Law: whenever a force is applied to an object, that object simultaneously exerts an equal and opposite force uniform motion if it travels in a straight line at constant speed. All other motions are called accelerated Newton's law of universal gravitation . Between any two objects in universe there is an attractive force (gravity) that is proportional to the masses of the objects and inversely proportional to the distance between them. Gravity force (= m * a) g=9.81 m/s2 Weight mass * acceleration from gravity W = m * g force (in N) Inertia is the tendency of an object to resist any change in its motion. Inertia is directly related to how much mass an object has -- how much stuff is there. Force mass * acceleration N = kg m /s^2 Work Work is equal to the force that is exerted times the distance over which it is exerted In equation form: work (in Joules) = force (in Newtons) * distance (in meters) Energy ability to do work J power * time Power is defined as the rate at which work is done, or at which energy is expended. In words: Power is the amount of work done, divided by the time it takes to do it. In equation form: power (in watts) = work (in joules) / time (in seconds) P = W / t Energy of Motion -- ``Kinetic Energy'' vibrating moving turning is energy associated with moving objects Stored Energy -- ``Potential Energy'' springs chemical electrical gravitational is energy waiting to be released. Properties of a substance which depends on the temperature: Volume: (in general, the volume increases with increasing temperature) States: solid - fluid - gas Properties of materials: elasticity, electric resistance, speed of sound Pressure Pressure is defined as force per area. The area is measured in m2, the force in N. The unit of pressure is N / m2 P = F / A Mechanical Waves a disturbance moving through a medium. Source of disturbance -- vibrating object Medium to disturb -- but NO net displacement Adjacent portions of medium are connected -- to carry the disturbance Carry Energy and Momentum Frequency: f=1/t Unit is Hertz : [Hz] = [1/s] Hooke's Law FS = -k * x Force = - constant * [displacement from equilibrium] F = -k * x = m * a a = -(k/m) * x fundamental frequency depends on radius R of drum tension of membrane T material of membrane d