แผ่นงาน1D Kinematics & Free Fall
คำถามทั้งหมด: 20
An object in free fall is acted on only by the force of gravity
True
False
A very massive object will free fall at the same rate of acceleration as a less massive object
True
False
If an object has an acceleration of 0 m/s2, then one can be sure that the object is not ___.
moving
changing position
changing velocity
When a rock is dropped, it will accelerate downward at a rate of 9.8 m/s^2. If the same rock is thrown downward (instead of being dropped from rest), its acceleration will be ___.
less than 9.8 s2m
more than 9.8 s2m
9.8 s2m
In addition to time, which of the following must be used for a more complete description of the average acceleration of an object?
Mass
Displacement
Velocity
None of these
What is the acceleration of an object moving at constant velocity?
2 m/s2
1 m/s2
0 m/s2
0.8 m/s2
What is the difference between a vector quantity and a scalar quantity?
A scalar has a magnitude and direction and a vector has only a magnitude
A vector has a magnitude and direction and a scalar has only a magnitude
A scalar has a direction and a vector has a magnitude
None of the above
A baseball catcher throws a ball straight up and catches it in the same spot. A what point in the balls trajectory does it experience a velocity of zero.
Midway on the way up
At its peak height
The instant it leaves the catchers hand
The instant before it arrives in the catchers mitt
A ball is thrown straight up into the air. As the ball travels upward, the speed of the ball
increases
decreases
stays the same
behaves randomly
A BASE jumper jumps off a building. As the jumper falls downward, his speed will.
increase
decrease
stay the same
behave randomly
Which of the following correctly describes what happens during a free fall?
Kinetic energy is converted to potential energy.
Velocity is constant.
Acceleration is constant.
Acceleration increases with the fall.
An automobile with an initial speed of 4.30 m/s accelerates uniformly at the rate of 3.0 m/s2. Find the final speed after 5.0 s.
Δx = v0t + 21 at 2
vf2 = v02 + 2a Δx
vf = v0 + at
v = tΔx
A car traveling initially at +7.0 m/s accelerates uniformly at the rate of +0.80 m/s2 for a distance of 245 m. What is its velocity at the end of the acceleration?
Δx = v0t + 21 at2
vf2 = v02 + 2a Δx
vf = v0 + at
a = tΔv
A car accelerates uniformly in a straight line from rest at the rate of 2.3 m/s2. How long does it take the car to travel 55 m?
Δx = v0t + 21 at2
vf2 = v02 + 2a Δx
vf = v0 + at
Δx = vt
Turner’s treadmill runs with a velocity of -1.2 m/s and speeds up at regular intervals during a half-hour workout. After 25 min (1500 s), the treadmill has a velocity of -6.5 m/s. What is the average acceleration of the treadmill during this period?
Δx = v0t + 21 at2
vf2 = v02 + 2a Δx
vf = v0 + at
v = tΔx
Acceptable Metric Units of Velocity are:
kg/L
ft/s
m/s
km/hr
kg/min
The Position vs. Time graph of an object experiencing constant (nonzero) acceleration looks like:
A Straight Line with Nonzero Slope
A Horizontal Line
A Parabolic Curve
A Logarithmic Curve
The Velocity vs. Time graph for an object experiencing constant (nonzero) acceleration looks like:
A Horizontal Line
A Straight Line with a defined, nonzero slope
A Vertical Line
A Parabolic Curve
A paint brush is dropped from the top of a tall ladder and free falls to the ground. What changes, if any, would be observed of the velocity and the acceleration of the brush as it falls? Pick 2 answers.
The velocity increases.
The velocity decreases.
The velocity remains a constant value.
The acceleration changes (increases or decreases).
The acceleration remains a constant value.
แป้นคำตอบ1D Kinematics & Free Fall
คำถามทั้งหมด: 20
True
True
changing velocity
9.8 s2m
Velocity
0 m/s2
A vector has a magnitude and direction and a scalar has only a magnitude
At its peak height
decreases
increase
Acceleration is constant.
vf = v0 + at
vf2 = v02 + 2a Δx
Δx = v0t + 21 at2
vf = v0 + at
m/s
, d)km/hr
A Parabolic Curve
A Straight Line with a defined, nonzero slope
The velocity increases.
, e)The acceleration remains a constant value.
