Physics Study Guide unit one

Question 1

what is the definition of a hypothesis?

Answer 1

educated guess, proposed reasoning OR proposed explanation experiments are used to test the Hypothesis

Question 2

Can a hypothesis ever be completely proven through experiments?

Answer 2

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.

Question 3

Describe the difference between qualitative and quantitative measurement.

Answer 3

Qualitative: Measures the quality of something. It is subjective ex: feelings
Quantitative: Measures the quantity of something. It is NOT subjective ex: data

Question 4

List the metric unite of length, mass, weight, time, volume, temperature.

Answer 4

length = Meter, m, Mass = Kilogram, kg, weight = newton, N, Time = Seconds, s, Volume: Liter, L, Temperature = degree Kelvin K …also Celsius C

Question 5

list the English unit of length, mass, weight, time, volume and tempreture

Answer 5

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)

Question 6

convert 340 ml to L

Answer 6

.340 L

Question 7

state the definition of a reference point

Answer 7

also known as the origin. Often labeled zero

Question 8

State the definition of position:

Answer 8

A location/spot with respect to an origin

Question 9

State the definition of motion:

Answer 9

Changing position with respect to a reference point.

Question 10

State the definition of speed:

Answer 10

Change in position with respect to time. Scalar, just a magnitude, NOT DIRECTION SPECIFIC

Question 11

Write the equation form speed:

Answer 11

s=distance/time or s=d/t

Question 12

what are some appropriate units of speed?

Answer 12

m/s,mph etc

Question 13

Calculated speed if a distance of 400 m is traveled in 5 sec.

Answer 13

400m/5s = 80 m/s

Question 14

write the equation for average speed:

Answer 14

Speed average = total distance covered/time

Question 15

State the definition of velocity:

Answer 15

Change in position with respect to time. Vector magnitude and direction. V= Change x(position)/change t

Question 16

If you are traveling a constant velocity, would you instantaneous and average velocity be the same, or different?

Answer 16

The same, for the average velocity to be different you must change velocities.

Question 17

A bus has a velocity of 10 m/s north. You walk down the aisle at 1m/s south. What is your resultant velocity?

Answer 17

10 m/s - 1m/s = 9 m/s Vectors south or down is negative, north or up is positve

Question 18

State the definition of acceleration and deceleration:

Answer 18

Acceleration applies to decreases as well as increases in velocity. However, deceleration is only slowing down and is not often used in physics.

Question 19

Explain the difference between positive and negative acceleration:

Answer 19

positive acceleration = increasing speed. negative acceleration = decreasing speed

Question 20

write the equation for acceleration

Answer 20

a= change v/ change t, change in velocity/ change in time

Question 21

what are some appropriate units of acceleration?

Answer 21

m/s2, (meters per second squared)

Question 22

Calculate the acceleration of an object that goes from 25 m/s to 10 m/s in 3 seconds.

Answer 22

(10m/s - 25m/s)/3s = -5m/s2

Question 23

What are the six steps of the scientific method?

Answer 23

1. recognize the problem or unknown. 2. Make a hypothesis 3. make a prediction 4. experiment 5. Conclude 6. Communicate