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65 Cards in this Set
- Front
- Back
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Newtoms 3rd Law
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*for every action force, there is a reaction force equal in strength and opposite in direction.
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Momentum
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*measures a moving object's resistance to changes in its motion.
*units of momentum are the units of mass multiplied by the units of velocity. |
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Impulse
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*a change in momentum created by a force exerted over time.
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Elastic Collision
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*occurs when objects collide so that the total kinetic energy remians the same before and after the collision.
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Energy
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*a fundamental quantity of the universe; measure of ability to change or create change.
*energy is required to make force do work, change motion, raise temperature, create new matter, break chemical bonds, or push electric current through a wave. |
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Work
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*a form of energy,
*force x distance |
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Potential energy
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*stored energy that comes from position.
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Kinetic Energy
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*energy from motion.
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Law of the Conservation of Momentum
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*the toal momentum in a system of interacting objects cannot change as long as all forces act only between the objects in the system.
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joule
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*unit of measurement for energy
*one joule is the energy needed to push with a force of one newton over a distance of one meter. |
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Law of Conservation of energy
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*the law states that energy can never be created or destroyed, just converted from one form into another.
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Inelastic Collision
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*objects change shape or stick together.
*energy is not destroyed, but it is transformed into forms. |
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Machine
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*a device with moving parts that work together to accomplish as task.
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Input
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*includes everthing you do to make the machine work.
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Output
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*what the machine does for you.
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Mechanical advantage
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*a machine is the ratio of the output force to the input force.
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Efficiency
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*a ration of a machines's output to input work.
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Friction
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*the force that results from relative motion between objects.
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Horsepower
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*unit of power
*one horsepower is equal to 746 watts |
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Output arm & Input arm
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*the side of a lever between the fulcrum and the input force.
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Irreversible Process
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*can only run forward and cannot run backward.
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Inclined plane
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*ramp
*simple machine |
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simple machine
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*gear, pulley, screw
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gear ration
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*gear ration= output/input
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A cicycle is an example of what type of machine
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*complex
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Work output= work input is used to describe what type of machine?
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*simple
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The ratio of output force to input force of a simple machine is called?
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*mechanical advantage
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The ratio of useful work output to total work input is called?
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*Efficiency
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Force of an object that has traveled a distance is the definition of what?
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*work
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The unit used for force is?
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*newton
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The metric unit for work is?
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joule
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Power is measured in what unit?
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*watt
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How we measure the amout of change that is possible?
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energy
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Why do air bags reduce injuries in a collision?
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*increase time
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A factor that affects the behavior of a system?
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variables
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Anything that has mass and takes up space?
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matter
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A carefully designed test done under controlled conditions?
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experiment
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Measures the amount of matter that makes up an object?
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mass
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This system of measurement uses feet?
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english
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Distance something traveled by the time it took to travel that far?
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*speed
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A set of rules that is based upon recurring facts that have been carefully documented?
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Natural Law
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This helps people communicate amounts of things?
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*units
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This shows how two variables are related?
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graph
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When something has high energy it is considered?
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unstable
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The independent variable goes on which axis?
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x
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An educated guess that predicts the relationship between the independent and the dependent variables in the experiement?
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hypothesis
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This type of variable is kept the same in the experiment?
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control
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What is the equation for speed?
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V=D/T
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For every of for each means?
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per
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What is the equation for distance?
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D=VxT
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What variable is placed on the Y axis?
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Dependent
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The detailed explanation of the results of an experiment?
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analysis
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A type of scale that can be observed and measured?
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macroscope
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This system is easily used because it is based on factors of 10?
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metric
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This changes according to where you are at in the universe
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weights
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The units used for velocity?
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m/sec
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The slowing down of an object?
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deceleration
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Newton's 2nd Law formula?
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F=m x a
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Units for acceleration?
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m/sec2
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The force of gravity is balanced by the air resistance of an object?
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terminal speed
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Rise/Run
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slope
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Newton's 1st Law
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*an object at rest will stay at rest or an object in motion will stay in motion with the same speed and direction.
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9.8 m/sec2
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acceleration due to gravity
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On a speed vs time graph, what does a constant speed look like?
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straight line
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On a position vs time graph, what does a stright line represent?
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deceleration
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