Physical Science Test 1

Question 1

Equation for density

Answer 1

d=m/v

Question 2

Equation for velocity/ speed

Answer 2

v=d/t

Question 3

Equation for acceleration

Answer 3

_►v _ _ v_f-v_i _

         a=     t    =          t

Question 4

Equation for distance of a dropped object

Answer 4

d=(1/2)gt²

Question 5

Equation for final velocity as object strike the ground

Answer 5

v_f=gt

Question 6

SI unit for length

Answer 6

meters (m)

Question 7

SI unit for mass

Answer 7

Kilogram (kg)

Question 8

SI unit for time

Answer 8

seconds (s)

Question 9

SI unit for volume

Answer 9

fluid- milliliter (mL)

solid- cubic meter (m³)

Question 10

SI unit for density

Answer 10

g/mL or g/cm³

Question 11

SI unit for speed/ velocity

Answer 11

m/s

Question 12

SI unit for acceleration

Answer 12

m/s²

Question 13

Measurement for gravity

Answer 13

9.8m/s²

Question 14

-a concise statement in words or a mathematical equation about a fundamental relationship in nature.

Answer 14

Scientific Law

Question 15

-a well-tested explanation of a broad segment of natural phenomena

Answer 15

Scientific Theory

Question 16

3 Steps to Scientific Method

Answer 16

1. Make an observation.
2. Make a hypothesis.
3. Test the hypothesis.

Question 17

What is a hypothesis?

Answer 17

NOT an educated guess. A possible solution or explanation for the observation.

Question 18

-measurement of space in any direction.

Answer 18

Length

Question 19

• amount of matter an object contains.

Answer 19

Mass

Question 20

-Continuous, forward flowing of events.

Answer 20

Time

Question 21

• fluid, volume, or capacity.

Answer 21

Volume

Question 22

Name the units of measurement, the abbreviations, and value in order.

Answer 22

kilo hecta deca 1 deci centi milli

k h da 1 d c m

1,000 100 10 1 1/10 1/100 1/1000

                                                    0.1       0.01      0.001

Question 23

Name the other units of measurement, their abbreviations, and value

Answer 23

giga (G): 1,000,000,000 (10⁹)

mega (M): 1,000,000 (10⁶)

micro (ü): 0.000001 (10^-6)

nano (n): 0.000000001 (10^-9)

Question 24

What are the rules for Sig Figs?

Answer 24

1. All non-zero digits are significant.
2. All zeros between non-zero digits are significant.
3. Trailing zeros without a decimal are always significant.
4. Trailin zeros with a decimal are ambiguous.
5. Zeros in front are never significant.
6. Known, counted or exact numbers are considered to have an infinite number of sig figs.

Question 25

What are the Sig Fig rules in mathematical operations?

Answer 25

• when multiplying or dividing, your answer should be rounded to contain as many sig figs as there are in the quantity with the least number of sig figs.
• when adding or subtracting, leave the same number of decimal places in the answer as there are in the quantity with the least number of decimal places.

Question 26

• closeness of results to the true or accepted value

Answer 26

Accuracy

Question 27

• getting the same or nearly the same results for repeated measurements.

Answer 27

Percision

Question 28

• the amount of mass in a definite volume.

Answer 28

Density

Question 29

• refers to location of an object implied by some reference point.

Answer 29

Position

Question 30

• a continuous change in position referenced by length and time

Answer 30

Motion

Question 31

• a scalor quantitiy specifying the total distance traveled by an object divided by the time spent traveling the total distance.

Answer 31

Speed

Question 32

• same as speed, but a vector quantity, describe both magnitude and speed.

Answer 32

Velocity

Question 33

• results from a change in speed, a change in direction, or both.

Answer 33

Acceleration

Question 34

-objects in motion solely under the influence of gravity.

Answer 34

Free Fall