CLASSICAL MECHANICS correct
and verified answers(graded
A+}
real
What is friction? - correct answer-Friction works to
oppose motion between surfaces, up to some
maximum opposing force.
- works AGAINST us e.g. wear and tear
- works FOR us e.g. keeps car on road
,-An object will remain in constant motion unless a
resultant force acts on it
- 1st law=law of inertia
- it is not always valid. When it is valid, it is called an
inertial reference frame
e.g.
A plane travels at a constant speed and has a ball
inside which remains at rest. However, if the plane
begins to accelerate the ball will roll backwards, so
the 1st law is not valid (not an inertial reference
frame)
Define Scalar - correct answer-A quantity with
magnitude
Define Vector - correct answer-A quantity with
direction AND magnitude
,Vectors are equal if... what? - correct answer-
magnitude and direction are equal
Does the dot product produce a scalar or a vector? -
correct answer-A scalar
What does {a} . {b} equal? - correct answer-
|{a}||{b}|cosθ
Is the cross product parallel or perpendicular to {a}
and {b}? - correct answer-PERPENDICULAR
According to RHR:
1) point fingers towards a
2) curl towards b
3) thumb gives direction
What is dimensional analysis? - correct answer-A
way to analyze and solve problems using the units,
or dimensions, of the measurements
, mass - M
length - L
time - T
What is dimensional homogeneity? - correct
answer-To check units on the RHS and LHS of the
equation are the same.
Define displacement - correct answer-The change in
position, which is the vector pointing from x(i) to
x(f)
Define velocity - correct answer-The rate of change
of position, a vector whose x-component is the x-
component of the displacement divided by the time
interval
What is the equation for average velocity? - correct
answer-Vavg= Total displacement / Time (x-
and verified answers(graded
A+}
real
What is friction? - correct answer-Friction works to
oppose motion between surfaces, up to some
maximum opposing force.
- works AGAINST us e.g. wear and tear
- works FOR us e.g. keeps car on road
,-An object will remain in constant motion unless a
resultant force acts on it
- 1st law=law of inertia
- it is not always valid. When it is valid, it is called an
inertial reference frame
e.g.
A plane travels at a constant speed and has a ball
inside which remains at rest. However, if the plane
begins to accelerate the ball will roll backwards, so
the 1st law is not valid (not an inertial reference
frame)
Define Scalar - correct answer-A quantity with
magnitude
Define Vector - correct answer-A quantity with
direction AND magnitude
,Vectors are equal if... what? - correct answer-
magnitude and direction are equal
Does the dot product produce a scalar or a vector? -
correct answer-A scalar
What does {a} . {b} equal? - correct answer-
|{a}||{b}|cosθ
Is the cross product parallel or perpendicular to {a}
and {b}? - correct answer-PERPENDICULAR
According to RHR:
1) point fingers towards a
2) curl towards b
3) thumb gives direction
What is dimensional analysis? - correct answer-A
way to analyze and solve problems using the units,
or dimensions, of the measurements
, mass - M
length - L
time - T
What is dimensional homogeneity? - correct
answer-To check units on the RHS and LHS of the
equation are the same.
Define displacement - correct answer-The change in
position, which is the vector pointing from x(i) to
x(f)
Define velocity - correct answer-The rate of change
of position, a vector whose x-component is the x-
component of the displacement divided by the time
interval
What is the equation for average velocity? - correct
answer-Vavg= Total displacement / Time (x-
