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Semester 1 Final ILS

QuestionAnswer
What is energy with movement called? kinetic energy
Energy that is normally associated with heat or friction. Thermal energy
Ability to do work energy
What is the volume of a liquid measure in? liters or milliliters
How much larger is a centimeter than a millimeter? 10 times
What is a broad explanation that is widely accepted because it is backed up by a great deal of evidence? theory
force that pulls objects toward the center of the Earth at 9.8 m/s/s gravity
when is something considered a projectile? when only the force of gravity is acting on the object
energy cannot be created or destroyed Law of conservation of energy
Energy that is dependent upon the height or position of the object potential energy
a measurement with direction and magnitude vector
a measurement with only magnitude scalar
word that means "not a factor" negligible
another way to think of frame of reference is a particular point of view
How are scientific theories different from the everyday use of theory? scientific theories are backed by data and evidence, while the everyday use of theory is more of a guess
In a physics problem sometimes direction is indicated using a positive or negative sign
on a distance time graph the __________ of the line indicates average speed of the object slope
study of motion kinematics
when some thing is draw to scale it is draw to ________________ proportion
speed at a particular instant instantaneous speed
balance point of an object center of mass
frame of reference from the Earth in which the object is moving at a constant velocity inertial frame of reference
force that acts against objects moving through the air air resistance
angle at which a projectile moves through the air trajectory
kinetic energy most often converts to ___________ energy causing the object to slow down thermal
if net force is zero then no __________________ will occur on an object acceleration
observation with numbers quantitative observation
observation using features qualitative observation
The acceleration due to gravity on Earth is 9.8 m/s/s
What does it mean if you hear "Air resistance is negligible?" not a factor in the projectile's movement
Acceleration is.... speeding up, slowing down, or changing direction
Newton's First Law An object at rest remains at rest unless an net force greater than zero acts on it. An object in motion remains in motion unless a net force greater than zero acts on it.
Newton's Second Law Force is proportional to the mass and acceleration of the object
Newton's Third Law Each force has an equal and opposite reactionary force
If a passenger is in a train moving at 30 m/s east, the passenger gets up and walks 2 m/s in the opposite direction of the moving train. From an observer outside the train, how fast would it look like the passenger was moving? 28m/s east
A person walks 1 mile every day for exercise, leaving her front porch at 9:00 A.M. and returning to her front porch at 9:25 A.M. What is the total displacement of her daily walk? zero displacement (because the start and finish point are the same.)
A car traveled 88 km in 1 hour, 90 km in the next 2 hours, and then 76 km in 1 hour before reaching its destination. What was the car’s average speed? 63.5 km/h (add up the total distance and divide by the total time)
An object in free fall near the surface of the Earth experiences what constant (velocity or acceleration?) acceleration
Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 2 s. What is your acceleration? 1 m/s/s
What is a change in velocity? acceleration
What is speed in a direction? velocity
What is speed? the amount of distance in a given time
What is the difference between distance and displacement? distance is the total amount of a trip, while displacement is only concerned about start to finish and direction
If you are sitting on a train, and the train is traveling at 30 m/s, how fast are you traveling relative to the train? 0 m/s
Why are we always in motion relative to the Sun? We are moving around the Sun on the Earth at a very high velocity
What is the equation for finding the average speed of an object? distance/time
What is the equation for finding acceleration of an object? change in velocity/time
What is the equation for finding the force of an object? mass multiplied by acceleration
Kinetic energy depends mostly on an object's motion or velocity
Which law is at work in this situation? Two ice skaters are in the middle of a rink. One pushes off the other, they both move backwards at the same rate in opposite directions 3rd
Which law is at work in this situation? An elephant is charging at you, your best bet is to run in a zig zag line because the elephant's large mass makes it harder to change direction. 1st
Which law is at work in this situation? You notice two carts. One has twice as much mass as the other. You push with the same force, but the cart with less mass accelerates greater. 2nd
information gathered by your senses observation
A hypothesis must be three things to be valid tentative, testable, falsifiable
Why are some things not in the realm of science, like opinions or fairy tales? they cannot be tested
A prediction made using observations and prior knowledge inference
independent variables variable that is being tested
dependent variables variable that is the outcome of the experiment
constants variable that remains the same throughout the experiment
how the data fits together is known as a... trend
What are the steps to our lab procedures? make an observation, ask a question, form a hypothesis, create a procedure, run the test, collect and analyze data, communicate findings
what is needed when writing a good scientific argument? evidence and data
Length meters, cm, mm, km
time seconds, minutes, hours
acceleration m/s/s
Velocity or speed m/s or km/hr
Mass kg, g, or mg
Force Newton
Energy Joule
Volume liter or milliliter
How many cm in a m? 100
How many mm in a cm? 10
Know steps to solving a conversion factor problem 1. Write what you are given 2. Write the same unit diagonal 3. Write out the equivalent 4. Cross out the like units 5. Multiply the top and divide by the bottom.
What is the potential energy of an object that reaches a height of 30 meters and had a mass of 6.5kg? 1,911 J (mass x gravity x height)
An experiment where only one variable is changed or tested in the experiment is called a ____________________ Controlled experiment
Total length of an object distance
Length and direction from starting point to finish point displacement
Mass' tendency to keep doing what its doing inertia
force distributed over an area pressure
gravity's effect on mass weight