PHY 111 Final Exam Questions with Verified
Correct Answers
Theory
a well-substantiated explanation of some aspect of the natural world
hypothesis
a proposed scientific explanation for a set of observations
Johannes Kepler
German astronomer who first stated laws of planetary motion (1571-1630)
Ptolemy
Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed
until Copernicus (2nd century AD)
Polaris
the north star
Copernicus
Polish astronomer who produced a workable model of the solar system with the sun in the
center (1473-1543)
gram
a metric unit of mass equal to one thousandth of a kilogram
meter
the basic unit of length adopted under the Systeme International d'Unites (approximately
1.094 yards)
, scientific method
a series of steps followed to solve problems including collecting data, formulating a
hypothesis, testing the hypothesis, and stating conclusions
Newton's Law of Gravity
Law stating any two objects are attracted to each other; the magnitude of the attraction
depends on the masses of the two objects and the distance between the two objects.
Gravity is slightly less on a mountain and therefore you weigh less - w = m x g
Why is your weight less on a mountain top compared to sea level?
Scalar quantity
A quantity that has only magnitude
Vector quantity
quantity having both magnitude and direction
Speed/velocity
rate at which an object covers distance
Acceleration of gravity
9.8 m/s2
acceleration
(physics) a rate of change of velocity
Newton's First Law of Motion
Correct Answers
Theory
a well-substantiated explanation of some aspect of the natural world
hypothesis
a proposed scientific explanation for a set of observations
Johannes Kepler
German astronomer who first stated laws of planetary motion (1571-1630)
Ptolemy
Alexandrian astronomer who proposed a geocentric system of astronomy that was undisputed
until Copernicus (2nd century AD)
Polaris
the north star
Copernicus
Polish astronomer who produced a workable model of the solar system with the sun in the
center (1473-1543)
gram
a metric unit of mass equal to one thousandth of a kilogram
meter
the basic unit of length adopted under the Systeme International d'Unites (approximately
1.094 yards)
, scientific method
a series of steps followed to solve problems including collecting data, formulating a
hypothesis, testing the hypothesis, and stating conclusions
Newton's Law of Gravity
Law stating any two objects are attracted to each other; the magnitude of the attraction
depends on the masses of the two objects and the distance between the two objects.
Gravity is slightly less on a mountain and therefore you weigh less - w = m x g
Why is your weight less on a mountain top compared to sea level?
Scalar quantity
A quantity that has only magnitude
Vector quantity
quantity having both magnitude and direction
Speed/velocity
rate at which an object covers distance
Acceleration of gravity
9.8 m/s2
acceleration
(physics) a rate of change of velocity
Newton's First Law of Motion
