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science exam
exam time, yay....🙃
| Question | Answer |
|---|---|
| mass | the quantity of matter in an object the measure of inertia |
| inertia | the tendency of all objects to resist any change in motion |
| tension | stretching force |
| equilibrium | when the net force on something is zero |
| interaction | mutual action between objects where each object exerts an equal opposite force on the other |
| velocity | speed and direction of an object |
| free fall | motion under the influence of gravitational pull only |
| air resistance | friction resistance due to motion through the air |
| acceleration | the rate at which velocity changes with time |
| weight | a force due to gravity on an objects mass |
| lift | the upword reaction force |
| when a cannon ball is shot from a cannon, they both experience equal amounts of | force. |
| an object has no change in its state of motion when it is | at rest moving at constant velocity in equilibrium |
| how would an object have a very little acceleration | a light object pushed with a small force |
| a karate chap delivers a force of 3000N to a board that breaks, the force that acts on the hand during this event is- | 3000N |
| the team that wins at tug of war is the team that | pushes the hardest against the ground |
| the heavyweight boxing champing of the world cant hit a piece of paper with much force because | the paper cant produce much opposite force. |
| a Mack truck and Volkswagen traveling at the same speed have a head on collision. the force that the Mack truck hits the Volkswagen will be ------ the force that the Volkswagen hits the Mack truck. | equal too |
| to know an objects velocity you need to know what things? | speed and direction |
| when an object falling has a net fore of zero what is called? | terminal velocity |
| if an objects mass is decreasing while a constant force is applied to the object the acceleration what? | increases |
| force that is caused by a rope or spring | tension force |
| force that always opposes motion | friction force |
| force that is also known as weight | gravity force |
| action and reaction forces comprise the parts of an--- | interaction |
| a 1-kg mass at earths surface weighs about-- | 9.8N |
| newtons 1st law | an object at rest will stay at rest, and a object in motion will stay at the same speed and direction unless acted upon by an outside force |
| newtons 2nd law | acceleration caused by a net force is directly proportional to the net force, in the same direction as the net force, and inversely proportional to the mass of the object |
| newtons 3rd law | whenever one object exerts a force on a second object the second object exerts an equal opposite force on the first object. |
| why is it important for a pilot to know wind velocity? | he need the know the speed and direction of the wind |
| in the absence of air resistance why will a rock and a pebble acceleration equally when dropped? | their ratio of weight to mass is equal |
| what is acceleration | the rate of change in velocity |
| does weight or mass or both change when gravity changes | mass doesn't change weight does |
| a common unbalanced force acting on objects in motion | friction force |
| when a bowling ball collides with a bowling pin, the momentum of the ball | decreases slightly as the velocity as the velocity of the pin increases |
| control | a standard for comparison in experimentation |
| model | a visual, verbal, and/or mathematical explanation of experimental data. |
| extrapolation | the prediction of data beyond the graphed data point |
| accuracy | an indication of how close a measurement is to the true value |
| qualitive data | information described by the 5 senses. |
| interpolation | the predictions of data located between known data points |
| density | an objects mass divided by its volume |
| precision | an indication of how good the measuring device was. |
| hypothesis | a testable statement |
| science | organized body of knowledge about nature |
| law | a generalization that describes a wide variety of behaviors in nature |
| quantative data | numerical data |
| scientific method | observation hypothesis experiments conclusion |
| in science a theory is | a synthesis of a large body of well tested knowledge |
| what is an example of a unit of volume | mililiter |
| what is physical science | the study of nonliving matter |
| an example of quantitative data | the liquid has a temperature of 55.6 degrees C |
| pseudoscience | its presented as science but cant be proven fake science |
| hypothesis must be --- | testible |
| what type of thinking do we use in science | logical thinking |
| independent variable | a variable you can change |
| dependent variable | a variable that changes based on the independent variable |
| how to do a line graph | list variables name sides |
| watt | unit of power, 1 joule per second |
| energy | the property of a system that allows it to do work |
| work | the product of force and the distance through which force moves |
| kinetic energy | energy in motion |
| lever | simplest machine |
| momentum | an objects mass multiplied by its velocity |
| fulcrum | point of support |
| potential energy | stored energy |
| tangential velocity | velocity that is parallel to a curved path |
| power | the time rate of doing work |
| impulse | thr product of the force acting on an object and the time during which it acts |
| universal constant of gravity | the proportionality constant in newton's law of universal gravitation |
| a 1-kg ball has the same speed as a 10-kg ball, compared to the 1-kg ball the 10-kg ball has | 10 times as much momentum |
| inhabitants of the international space station do not have a | support force |
| when the distance between 2 stars decreases by half, the force between them | increases by four times as much |
| a cannon ball shot from a cannon with a long barrel will have greater muzzle velocity because the cannon ball receives greater | impulse |
| if you push an object twice as far while applying the same force how much work will you do | twice as much |
| a slow job and a fast job require the same amount of work, but different amounts of --- | power |
| a 1N for 1M in 1S will deliver a power of 1 | watt |
| an object is raised twice as high how much does it potential energy change | twice as much |
| a car moves 4 times as fast as the second car . the faster car how much more energy than the slow car | 16 times as much |
| does the earth attract the moon with a greater force then the moon attracts the earth | no they attract each other with an equal force newtons 3rd law |
| how to find momentum | mass times velocity |
| how to find impulse | force times time |
| how to find work | force times distance |
| how to find power | work over time |
| how to find PE | weight times height or mass times g (9.8-kg) times height |
| how to find KE | 1/2 (mass times velocity squared) |
| how to find F | G times (m1 times m2 over distance squared) |
| work law | work in = work out |
| G | 6.67 times 10^-11 N times M^2/kg^2 |
| how to find speed | speed equals distance over time |
| how to find acceleration | a= change in velocity over time a= force over mass |
| domanial annalysis | the way we turn one unit into another |
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ghost.is.boo
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