Unit 1, Ch 1 Practice MC Questions Flashcards
True or False:
A vector quantity is described with a direction and a scalar is not
true
True or False:
The velocity of an object refers to the rate at which the object’s position changes
true
True or False:
Accelerating objects MUST be changing their speed
false
(they can also be changing direction)
True or False:
An object experiencing uniform motion is accelerating
false
(objects in uniform motion have the same speed and direction)
Can an object have a northward velocity while experiencing a southward acceleration?
Yes, because it means the object is slowing down.
(This happens when a moving car driving north applies brakes and slows down)
On a position-time graph, a horizontal line means
no movement
On a position-time graph, a straight diagonal line means
constant velocity
On a position-time graph, a curved line means
accelerating
On a position-time graph, a gradually sloped line means
moving slowly
On a position-time graph, a steeply sloped line means
moving fast
On a velocity-time graph, a horizontal line means
constant velocity
On a velocity-time graph, a straight diagonal line means
accelerating
On a velocity-time graph, a gradually sloped line means
small acceleration
On a velocity-time graph, a steeply sloped line means
big acceleration
Which of the following is the term for the line an
object moves along from a particular starting point?
(a) motion
(b) distance
(c) position
(d) direction
(d) direction
true or false
Position is the distance of an object from a particular reference point
false
position is the distance and direction of an object from a particular reference point
The slope of a velocity–time graph gives the
___________ of the object
acceleration
The area under an acceleration–time graph represents the _________
change in velocity of an object
terminal velocity
Terminal velocity results from air resistance that
exerts a force on a falling object that is equal to the
force of gravity
- For the position–time graph of an object moving in one dimension, which of the following properties would imply that the object has motion with nonuniform velocity?
(a) The graph is a straight line with a slope of 3.
(b) The graph is a curve.
(c) The graph is a horizontal line.
(d) The graph is a negative line
(b) The graph is a curve.
the slope of a velocity–time graph will give you ________
acceleration
true or false
an object that’s dropped experiences an acceleration downward of 9.8m/s2 (down)
true
3m/s (east) is the same as
-3m/s (west)
instantaneous velocity is found by finding the tangent line on a
pt graph
0.0000561 in scientific notation
5.61 x 10^-5
uniform motion means
constant velocity
a quantity that has both a magnitude and a direction
vector quantity
movement at a constant velocity in a straight line
uniform motion
represented by the letter g
acceleration due to gravity
when a free-falling object reaches a constant velocity
terminal velocity
movement where there is either a change in direction or an acceleration
non-uniform motion
is it possible for an object with a negative acceleration to be speeding up?
-yes depends on if the velocity is negative as well
-if velocity and acceleration are the same sign/direction, object will speed up
-if velocity and acceleration are different signs/directions, object will slow down
