Physics Study Guide unit one Flashcards
what is the definition of a hypothesis?
educated guess, proposed reasoning OR proposed explanation experiments are used to test the Hypothesis
Can a hypothesis ever be completely proven through experiments?
No, a hypothesis can only: A) reject or B) fail to reject it.
BIG IDEA: there is not enough evidence to reject or prove the hypothesis.
Describe the difference between qualitative and quantitative measurement.
Qualitative: Measures the quality of something. It is subjective ex: feelings
Quantitative: Measures the quantity of something. It is NOT subjective ex: data
List the metric unite of length, mass, weight, time, volume, temperature.
length = Meter, m, Mass = Kilogram, kg, weight = newton, N, Time = Seconds, s, Volume: Liter, L, Temperature = degree Kelvin K …also Celsius C
list the English unit of length, mass, weight, time, volume and tempreture
Length= Foot, (ft.) Mass= slug or Pound Mass(lbmass), Weight= Pound or pound force(lbforce), Time = seconds, (s), Volume = Gallon, gal Temperature = degree Fahrenheit (F)
convert 340 ml to L
.340 L
state the definition of a reference point
also known as the origin. Often labeled zero
State the definition of position:
A location/spot with respect to an origin
State the definition of motion:
Changing position with respect to a reference point.
State the definition of speed:
Change in position with respect to time. Scalar, just a magnitude, NOT DIRECTION SPECIFIC
Write the equation form speed:
s=distance/time or s=d/t
what are some appropriate units of speed?
m/s,mph etc
Calculated speed if a distance of 400 m is traveled in 5 sec.
400m/5s = 80 m/s
write the equation for average speed:
Speed average = total distance covered/time
State the definition of velocity:
Change in position with respect to time. Vector magnitude and direction. V= Change x(position)/change t
If you are traveling a constant velocity, would you instantaneous and average velocity be the same, or different?
The same, for the average velocity to be different you must change velocities.
A bus has a velocity of 10 m/s north. You walk down the aisle at 1m/s south. What is your resultant velocity?
10 m/s - 1m/s = 9 m/s Vectors south or down is negative, north or up is positve
State the definition of acceleration and deceleration:
Acceleration applies to decreases as well as increases in velocity. However, deceleration is only slowing down and is not often used in physics.
Explain the difference between positive and negative acceleration:
positive acceleration = increasing speed. negative acceleration = decreasing speed
write the equation for acceleration
a= change v/ change t, change in velocity/ change in time
what are some appropriate units of acceleration?
m/s2, (meters per second squared)
Calculate the acceleration of an object that goes from 25 m/s to 10 m/s in 3 seconds.
(10m/s - 25m/s)/3s = -5m/s2
What are the six steps of the scientific method?
- recognize the problem or unknown. 2. Make a hypothesis 3. make a prediction 4. experiment 5. Conclude 6. Communicate
