Physics 2110 exam 1(Complete solutions)
what are scalar quantities? correct answersquantities with only magnitude
- described as a single number
define vector: correct answershas both magnitude which is a positive scalar, and direction
define negative vector correct answersvector that has the same magnitude but opposite direction
How do you add scalar quantities? correct answersscalar quantities can be added to other scalar
quantities using rules of ordinary addition
What is a vector quantity? correct answers-has direction
-ex. sun's pull on earth
- apply direction (N,S,W,E)
Position Vector correct answerspoints from origin to the objects location
Displacement: correct answers- displacement is a vector quantity that points from the initial
position of an object to its final position
- direction of an object's displacement is indicated by an arrow that begins on the initial position
of the object and ends on its final position
- the length of the arrow representing an object's displacement is proportional to its magnitude,
which represents the straight line distance between the positions
Kinematics: correct answersconcepts that are needed to describe motion, including displacement,
velocity, and acceleration
Dynamics: correct answersdeals with the effects that forces have on motion
Together, kinematics and dynamics form the branch of physics known as correct
answersmechanics
the difference between speed and velocity is correct answersVelocity has direction and speed
does not
Can speed be negative? correct answersNO
define average acceleration vector correct answerschange in velocity divided by elapsed time
Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 2
m/s2. Which one of the following statements accurately describes the motion of this particle?
correct answersThe speed of the particle increases by 2 m/s during each second.
instantaneous acceleration vector correct answersaverage acceleration vector in the limit of small
elapsed time
- gives acceleration at an instant time
what are scalar quantities? correct answersquantities with only magnitude
- described as a single number
define vector: correct answershas both magnitude which is a positive scalar, and direction
define negative vector correct answersvector that has the same magnitude but opposite direction
How do you add scalar quantities? correct answersscalar quantities can be added to other scalar
quantities using rules of ordinary addition
What is a vector quantity? correct answers-has direction
-ex. sun's pull on earth
- apply direction (N,S,W,E)
Position Vector correct answerspoints from origin to the objects location
Displacement: correct answers- displacement is a vector quantity that points from the initial
position of an object to its final position
- direction of an object's displacement is indicated by an arrow that begins on the initial position
of the object and ends on its final position
- the length of the arrow representing an object's displacement is proportional to its magnitude,
which represents the straight line distance between the positions
Kinematics: correct answersconcepts that are needed to describe motion, including displacement,
velocity, and acceleration
Dynamics: correct answersdeals with the effects that forces have on motion
Together, kinematics and dynamics form the branch of physics known as correct
answersmechanics
the difference between speed and velocity is correct answersVelocity has direction and speed
does not
Can speed be negative? correct answersNO
define average acceleration vector correct answerschange in velocity divided by elapsed time
Starting from rest, a particle confined to move along a straight line is accelerated at a rate of 2
m/s2. Which one of the following statements accurately describes the motion of this particle?
correct answersThe speed of the particle increases by 2 m/s during each second.
instantaneous acceleration vector correct answersaverage acceleration vector in the limit of small
elapsed time
- gives acceleration at an instant time
