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Physics Lab Final
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Terms in this set (35)
In this lab we determine the initial velocity of the ball by
Calculating it from the range of a horizontal launch
T predict how long it would take for a ball to hit the floor, we would need to know
Its initial height and its initial vertical velocity
The preliminary questions ask you about hitting two balls with a baseball bat, the two balls were a baseball and
A bowling ball
For this lab we will measure __________ and ________ of the cart
Force and acceleration
When the launch was adjusted to a nonzero angle i9n the second part of the lab, which of the following quantities also changed
the x-component of the initial velocity and the y-component of the initial velocity
Suppose the balls land in a location far from where you predicted, but all the marks are very close together. Which of the following statements would correctly describe your experimental results in this situation
The results were precise, but not accurate
The lab manual claims that air resistance is proportional to
velocity or velocity squared depending on the situation
The maximum speed of an object falling in the presence of air resistance is called
terminal velocity
What are the units of a force (in N) verses acceleration (in m/s^2) plot
Kg
in your experiment, you tried to test the relationship F=ma. Your data did not show this to be exactly true. What is the best explanation for this discrepancy
The force probe and accelerometer were not perfectly accurate and there were unaccounted for frictional forces
Air resistance on a falling coffee filter is proportional to (according to the results obtained by almost every group)
Velocity squared
Two set of coffee filters are falling at terminal velocity. the first set has two filters and take 2.5 seconds to fall one meter. The second set has 4 filters. How long does it take it to fall one meter
1.77 seconds
In the centripetal acceleration lab we will measure
The acceleration of an object spinning on a turn table and The angular velocity of the turn table
For the centripetal acceleration lab manual two preliminary questions dealt with
you on a merry go round
The graph of centripetal acceleration versus angular velocity was a
parabola
If the angular velocity is kept the same and you move closer to the center of a merry-go-round, the centrifugal force pulling you off the merry-go-round
was always a figment of your imagination
What form or forms of energy does the ball have while momentarily at rest at the top of the path
Potential energy only
What form of energy does the ball have while in motion the very instant before it hits the ground
kinetic energy only
if the total mechanical (kinetic plus potential) energy of the ball just before it lands slightly less than just after you threw it we should conclude
there was a non-conservative force which converted some of the mechanical energy to heat
In the ballistic pendulum experiment, the potential energy of the pendulum and ball together when they reach their maximum height is equal to the kinetic energy of the ball and pendulum together just after the ball hits the pendulum
true
In the ballistic pendulum experiment, the potential energy of the pendulum and ball together when they reach their maximum height is equal to the kinetic energy of the ball and pendulum together just before the ball hits the pendulum
false
Cars have airbags because by using them we can reduce the change in momentum a person has to go through during a crash
false
In the impulse-momentum lab, we are primarily going to test
the equation FΔ+mvᶠ-mvᵢ
As a rotating object experiences an unbalanced torque, it will
have a changing rotational velocity
When will more torque be applied to the rotating platform
when the string is wound around a groove with a larger radius
If an average force of 2.5 Newtons to the left is ap-plied for 0.054 seconds, the magnitude of the impulse is
0.135 N-s
It is possible to deliver the same impulse in question 3 (If an average force of 2.5 Newtons to the left is ap-plied for 0.054 seconds, the magnitude of the impulse is) with a force only half as big
yes, but only over a longer time
in the angular momentum experiment, what is conserved during the collision between the launched ball and the rotating platform
Angular momentum only
in the angular momentum experiment, how do we determine the initial speed of the rolling ball
We don't attempt to determine the initial speed
for the torque=I alpha experiment, how did the force producing the torque relate to the gravitational force acting on the hanging mass
the force making the torque was less than gravity
for the torque=I alpha experiment, the equation F=ma was replaced by its rotational equivalent, which created a linear plot where the slope was given by
The rotational inertia
Archimedes' principal states that
The buoyant force on an object is equal to the weight of the displaced fluid
According to the Archimedes' principal lab manual "the ratio of the weight of a given volume of the substance to an equal volume of water" is called the
Specific gravity
For the angular momentum lab, what kind of collision occurred
Totally inelastic
For the angular momentum lab, if the moment of inertia of the rotating bar holding the catcher were increased relative to what you used, how would the rotational velocity after the collision change
It would get smaller
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