ES 105 Practice quiz The first slide of each lab set contains the goals and objectives published in the lab manual Remember to bring the lab manual with your corrected labs Any printed keys of labs or this slide show will be confiscated Also bring a scantron and calculator Lab 1 Energy and energy transformations Investigate the concept of conservation of energy Explain transformation of energy Convert one type of energy to another Formulate explanations for energy that can seem to disappear Lab 1 Investigate the concept of conservation of energy Microwaves are Electromagnetic waves Mechanical energy Heat energy Chemical energy Gravitational potential energy Lab 1 Explain transformation of energy Since there is conservation of energy Energy is destroyed when it doesn t convert to a useful form You can never get energy from nothing You can create energy with friction Chemical energy is not useful for light All of the above Lab 1 Convert one type of energy to another When you turn a crank and light a light bulb you have Invented electricity Converted mechanical energy to electrical energy Converted heat energy to mechanical energy Converted mechanical energy to heat energy Converted light energy into electrical energy Converted light energy into heat energy Lab 1 Formulate explanations for energy that can seem to disappear When you convert mechanical energy into electricity you might lose energy It is destroyed It could be lost to heat of friction It could be saved in hidden places of the machine to be used later You measured wrong it wasn t really lost Ultraviolet light becomes visible in fluorescent bulbs Lab 2 Exploring Motion and Gravity Describe accelerated motion Determine the acceleration of gravity Lab 2 Describe accelerated motion The difference between velocity and acceleration is One is directional the other is not Velocity is an increase of a rate and acceleration is an increase of distance Acceleration is an increase of a rate and velocity is an increase in distance If you have no acceleration you have no speed You can go backwards without acceleration Lab 2 Describe accelerated motion Freefall When two objects that are similar in size and surface texture fall The lighter one always hits the ground last The lighter one always hits the ground first The mass does not affect the falling rate All of the above None of the above Lab 2 Describe accelerated motion Freefall You can always count on feathers falling slower than rocks because The feather has no terminal velocity The air resistance force on the feather is equal to the air resistance force on the rock due to the mass of the rock compared to its surface area You can t it depends on the size of each Of human error None of the above Lab 2 Describe accelerated motion Freefall When objects fall in a vacuum Their surface area is not a factor in the acceleration of their fall Their mass is not a factor in the acceleration of their fall Most things cannot fall if they are in a vacuum They only fall upward Small things fall faster than larger things Lab 2 Measuring Gravitational Acceleration When you find the distances an object falls in equal intervals of time The distances increase over time of falling The distances are constant because the time is equal Distances will vary depending upon the interval of time selected All of the above None of the above Lab 2 Determine the acceleration due to gravity Look at page 2 6 and assume this data was gathered on Mars at 1 30 of a second intervals If you have measured these values for yn in meters 0 000 0 004 0 012 0 025 0 041 what is the acceleration of gravity on Mars Choices 2 7 m s2 3 6 m s2 4 5 m s2 0 0164 m s2 0 004 m s2 Lab 2 Determining the acceleration due to gravity If you know that the acceleration due to gravity on Moon is 1 60 m s2 and you find your data indicates that it is 1 62 m s2 then the error in your data is 0 012 0 02 1 2 2 1 62 Lab 2 Acceleration due to gravity Error in gravity measurements may be due to Location of the apparatus compared to ideal Interference of the atmosphere Measurement errors All of these None of these Lab 3 Energy of Objects in Motion Further investigate the concept of conservation of energy Investigate the conversion of gravitational potential energy to kinetic energy Formulate explanations for energy that can seem to disappear Investigate frictional effect on motion Lab 3 Potential Energy If a ball is 6 cm above the surface of reference and it has a mass of 70 grams it has a potential energy of 0 0042 J 0 04116 J 0 167 J 11 67 J 420 J Lab 3 Kinetic Energy If the 70 gram ball is traveling at 1 m s its kinetic energy is 0 001225 J 0 035 J 0 167 J 35 J 1225 J Lab 3 Kinetic Energy If the velocity of a rolling ball in an apparatus like on page 3 4 seems to have a kinetic energy less than the potential energy before it began moving what could possibly the reasons for this The friction of the apparatus has slowed the ball The apparatus is not flat and the ball is gaining some potential energy as it rolls us the NOT horizontal surface Since the ball is rolling some energy goes into the rotation of the ball All of these may be influencing the ball movement None of these can be a factor only human error would lead to differences like this Lab 3 Investigate frictional effect on motion What effect does sandpaper have on the angle of sliding of a stationary rock The angle is greater without sandpaper The angle is greater with the sandpaper Wax paper increases the angle Neither wax paper or sand paper have any effect on the angle Since sandpaper is manmade friction does not influence landslides Lab 3 Forces influencing motion If a car has a mass of 500 kg and the net force exerted on it is 0 N about what is the acceleration of the car 5000 J 0 m s2 2 m s2 500 m s2 Unless you know how fast it is going you cannot calculate it Lab 4 Understanding geologic time Construct a time scale of geologic time Use fossils to determine the age of strata Develop a conceptual understanding of half life Determine the ages of materials from known half life and elapsed half lives Determine half lives from known times of known amounts of radioactive decay Lab 4 Geologic Time Scale If you look at geologic time drawn to scale it is obvious that Abundant marine invertebrates began about half of Earth s lifetime ago The time from the oldest rock to the first fossil is about half as long as the time from the first fossil to the time of abundant marine invertebrates Those two
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