# Common Assesment Review

 Mass Identify the unit of measurement and tool used measured in grams , triple beam balance liquid volume  Identify the unit of measurement and tool used liters, graduated cylinder solid volume Identify the unit of measurement and tool used LxWxH cm3 , ruler temperature Identify the unit of measurement and tool used Celsius, thermometer Explain each part of the scientific method 1. problem/question-what you are trying to figure out  2. Hypothesis- educated opinion  3. Experiment- must have control over independent and dependent  4. Data & Observation- must be detailed 5. analysis- answer questions and gives support data 6. conclusion- refers to hypothesis what's the purpose of having the control group and an experimental group? provides baseline for comparison Explain the independent and dependent variable. dependent = causeindependent= effect What are the metric prefixes in order from smallest to largest? micro, milli, centi, deci, unit, deca, hector, kilo, hega define displacement distance from starting point - vector quantity Define equilibrium rule forces up = forces down define force push or pull causing change in motion - vector quantity define friction force against motion - applied define net force overall force on object define newton unit of force (1N= 1KgM/s2) define speed distance traveled in certain time define support force or normal force called opposes gravity define vector quantity includes number and direction (velocity, acceleration, force, and displacement) define velocity speed with direction what does the phrase " frame of reference" refer to ? what you compare motion to What is your frame of reference for the following:  A. ground,sidewalk, signs, etc. b. universe, space c. earth,stars, etc In order to start an object in motion, what must you do ? overcome friction In order to keep an object moving  at a constant velocity (speed and direction), what must you do ? equal friction List the 4 forces we discussed. What direction do these forces act? gravity(down toward center) support/Normal (up against gravity) applied (direction of motion)friction (against motion) What is the formula for speed? s=d/t What are the units for distance, time, and speed? d= mi,m, km, etc.t= s, min, hr, etc.s= mi/hr, m/s, etc. One the following Position(Distance) vs. Time graph a. what should the x axis be labeled? b. what should the y-axis be labeled? c. what would the magnitude (size) of the slope tell you ? a. timeb. distancec. speed If a car comes to a stop in 3 seconds from 60 miles per hour, what is the car's acceleration 0-60mi/hr/3s = -20 mi/hr/s If an object has a net force other than zero, what is happening to the object? change speed and/or direction Is a car moving at a constant speed around a circular track accelerating? Why or why not? yes- changing direction What is the relationship between force and acceleration (assume that mass remains the same)? Give an example. direct: push boxes of same mass w/different force, more force= more acceleration What is the relationship between mass and acceleration( assume that force remains the same) Give an example. inverse: push more mass w/same force, will accel less What is newtons 2nd law f=maf=net force What are the standard units of mass, force, and acceleration? m=kgF=NA=m/s2 What is the difference between mass and weight? Explain what the term losing "weight" really means. mass=unaffected by gravityweight= affected by gravity loose weight= loose mass What is Newton's 3rd law? every action has equal and opposite reaction When you push on a wall with a force of 5 N, what is the wall's response 5N toward you If the force of a bat against the ball is the action force, what is the reaction? ball on bat If the ball pushing on the air is the action force, what is the reaction? air on ball Which experiences the greater force, a bug or the windshield it hits?? WHy?? none- the same define law of universal gravitation F directly proportional to m1xm2) F inversely proportional to d2. define inverse square law F inversely proportional to d2 define gravity F pulling toward center What is G? universal law of gravity constant What happens to the force of attraction between two objects . If the distance between them is decreased? decreased distance= increase force Which has more effect on the tides of the EARTH, THE SUN OR THE MOON? Why moon-closer Explain why you can never by truly weightless? Weight is a measure of F, F is always present (always have mass) so always have weight Explain why there will always be a force of attraction between two objects always mass! Explain why two objects dropped at the same time on Earth may not land at the same time, but those two objects will land at the same time if the experiment was performed on the moon. moon has no atmosphere, so no air resistance. More surface area= more affected by air resistance What is the value of acceleration due to gravity. What does this mean? g=9.8m/s2in free fall all objects on earth accelerates at 9.8m/s2 Authorjennx14 ID208789 Card SetCommon Assesment Review DescriptionScience Updated2013-03-22T03:38:44Z Show Answers