PHY 121 Exam Review Questions with Verified
Correct Answers
Velocity
change in position/ change in time
vector
'Going 25 mph and north'
Magnitude of Velocity is speed
For the case of 1-dimensional motion, is it possible for an object
to move in such a way that the distance it covers is:
1.) greater than the magnitude of its displacement,
2.) less than the magnitude of its displacement, or
3.) equal to the magnitude of its displacement?
A. Only 1 and 2 are possible
B. Only 1 and 3 are possible
C. Only 2 and 3 are possible
D. Only 1 is possible
E. All three scenarios are possible
B
Uniform motion
, -Motion at a constant speed in a straight line
-Equal displacements in equal time intervals
-Straight line on a graph
Non-uniform motion
-Unequal displacements in equal time intervals
-x vs. t graph is NOT a straight line.
• Displacements for any two equal time intervals are NOT the same
• Slope of a straight line between xf and xi = Average Velocity
*Connects the dots= slope is velocity
-For small Δt, even non-uniform motion becomes nearly uniform.
Newton's 1st Law
(Law of Inertia) an object in motion tends to stay in motion & an object at rest stays at rest
unless acted upon by an outside force.
Newton's Second Law
Force equals mass times acceleration
Newton's Third Law
For every action there is an equal and opposite reaction
Intensive quality
The variable (inside the system) that does not depend on the
volume of the system
Extensive quality
Correct Answers
Velocity
change in position/ change in time
vector
'Going 25 mph and north'
Magnitude of Velocity is speed
For the case of 1-dimensional motion, is it possible for an object
to move in such a way that the distance it covers is:
1.) greater than the magnitude of its displacement,
2.) less than the magnitude of its displacement, or
3.) equal to the magnitude of its displacement?
A. Only 1 and 2 are possible
B. Only 1 and 3 are possible
C. Only 2 and 3 are possible
D. Only 1 is possible
E. All three scenarios are possible
B
Uniform motion
, -Motion at a constant speed in a straight line
-Equal displacements in equal time intervals
-Straight line on a graph
Non-uniform motion
-Unequal displacements in equal time intervals
-x vs. t graph is NOT a straight line.
• Displacements for any two equal time intervals are NOT the same
• Slope of a straight line between xf and xi = Average Velocity
*Connects the dots= slope is velocity
-For small Δt, even non-uniform motion becomes nearly uniform.
Newton's 1st Law
(Law of Inertia) an object in motion tends to stay in motion & an object at rest stays at rest
unless acted upon by an outside force.
Newton's Second Law
Force equals mass times acceleration
Newton's Third Law
For every action there is an equal and opposite reaction
Intensive quality
The variable (inside the system) that does not depend on the
volume of the system
Extensive quality
