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92 Cards in this Set
- Front
- Back
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Measurement standard is defined as
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exact quantity
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kilo prefix is
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1000
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mili prefix is
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1/1000
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SI unit of temperature is
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K (Kelvin)
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Si unit for time is
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seconds
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variable on the x axis of a graph is
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independent variable
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in a graph showing change in temperature of a material over time temperature is
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dependent variable
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best graph used to show a fixed quantity broken down into parts is
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pie chart
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benefit of the SI unit
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measurements based on 10s
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Light bulb is an example of
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technology
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another word for technology is
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applied science
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gather information through the senses is
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observation
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the first step to an experiment is to
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state the problem
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rule or principle that describes nature is
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scientific law
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event based on repeated observation and experiments is
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theory
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how can you represent an idea , event , or object and better peoples knowledge of it ?
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model
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standard for comparison that helps to ensure that the experimental results is caused by the conditions being tested is called
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control
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factor that changes due to the manipulation of the independent variable
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dependent variable
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factor does not change in an experiment is the
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constant
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study of something to prove a hypothesis
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experiment
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application of scientific knowledge to help people is know as
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technology
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motion is change in
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position
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speed on the speedometer is
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instantaneous speed
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3 meters per second north is an example of
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velocity
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relationship between speed distance and time is
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s=d/t
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single point on a distance- time graph tells the
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instantaneous speed
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acceleration is the rate of change of
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velocity
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you ride a bike up a hill then back down your acceleration is
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negative going up and positive going down
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Equation to find acceleration
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vf-vi =( ..) / t
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horizontal line on a velocity/time graph shows
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0 acceleration
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inertia varies depending on
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mass
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newtons first law of motion is called
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the law of inertia
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upward force on an object falling through the air
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Air resistance
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relationship among mass, force , and acceleration is explained by
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newtons 2nd law
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in the absence of air ,a penny and a feather are dropped from the same height at the same time . what will happen
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the penny and feather fall at the same rate
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acceleration due to gravity is
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9.8 m/s squared
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according to newtons second law of motion
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F=m.a
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an object moves in a circular path it accelerates toward the center of the circle as a result of
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centripetal force
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The path of a projectile is
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curved , parabolic
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the greater the force applied to it the greater its
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acceleration will be , and applies to any object
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the size of gravitational force between two objects depends on
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mass and distance
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the farther from earth you get your weight
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decreases
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when force is exerted on a box an equal and opposite force is exerted by the box these forces are
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action and reaction forces
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in P=M X V ,P represents
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momentum
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top every action there is an equal and opposite reaction is
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newtons 3rd law of motion
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unit of momentum
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kilogram meters per second kg/m
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when two balls collide the momentum of the balls after the collision is explained by
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conservation of momentum
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an object in free fall seems to be
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weightless
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if gravity did not affect the path of a horizontally thrown ball , the ball would
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travel horizontally
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when an object falls its reacting to
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gravity
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force that retards motion between two surfaces that are touching is
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friction
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the greater an objects mass the greater its
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gravitational force
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when you push a box it doesn't move due to
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static friction
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kinetic energy of an object increases as its
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velocity increases
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the SI unit for energy is
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joule
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equation for kinetic energy
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1/2 M.V squared
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equation for potential gravitational energy
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M.A.H
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the total amount of energy in the universe
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remains constant
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energy does not have to involve
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motion
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Energy is measured in
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joules
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when swinging potential energy is greatest at
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your highest point , top of an arch
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total energy is equal to the sum of
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the potential and kinetic
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as an object falls its potential energy
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decreases
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Energy due to motion is
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Kinetic energy
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Energy cannot be created nor destroyed is the law of
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conservation of energy
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a surface slanted used to raise an object is an
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inclined plain
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a device that does work with only one movement and changes size or direction of force is a
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Simple machine
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a bar free to pivot about a fixed place is a
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leaver
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rate at witch work is done is
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power
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machine multiplies an effort is called
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mechanical advantage
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inclined plane with one or two slopping sides forms a machine called
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a wedge
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inclined plane wrapped around a cylindrical post
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a screw
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unit of power
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watt
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arrangement of pulleys designed to reduce effort
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block and tackle
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two simple machines that are part of a bicycle
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gear , wheel and axle
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all 3 classes of levers are found in
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the human body
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work done over a distance
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power
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friction changes useful work into
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thermal energy
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reduces flow of heat by conduction , convection and radiation is
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an insulator
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transfer of energy that does not require matter is
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radiation
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refrigerators and a/c units are examples of
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heat movers
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engines burn fuel by
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condensation
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gasoline and diesel engines are
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internal combustion
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all matter is in
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constant motion
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heat moves
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warmer to cooler
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energy is transferred through
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collisions
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resistance is measured in
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ohms
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electrical energy
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P= I.V
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Electron
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negative
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proton
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positive
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energy a wave carries is measured in
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amps
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frequency is measured in
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hertz
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