In lab 1 Graphical Matching we determined the initial velocity of the ball by:
A. Measuring it with a radar gun
B. Measuring it with a photo gate
C. Calculating it from the range of a horizontal launch
D. Calculating it from the range of an angled launch
C. Calculating it from the range of a horizontal launch
In lab 1 Graphical Matching to predict how long it would take for a ball to hit the floor, we would need to know.
A. Its initial height
B. Its initial vertical velocity
C. Its initial horizontal velocity
D. A. and B. only
E. A. B. and C.
E. A. Its initial height, B. Its initial vertical velocity and C. Its initial horizontal velocity
Which of the following descriptions matches this velocity versus time graph?
A. Stay still for half a second, walk forward at constant speed for half a second, stand still for half a second, walk backward for one second, stand still for half a second.
B. Stand still for half a second, accelerate forward for half a second, maintain constant forward velocity for half a second, slow down to a stop and then accelerate backwards over the course of one second, walk backward at constant speed for half a second.
C. Stand still for half a second, accelerate forward for half a second, stop for half a second, accelerate backwards over the course of one second, stop for half a second.
B. Stand still for half a second, accelerate forward for half a second, maintain constant forward velocity for half a second, slow down to a stop and then accelerate backwards over the course of one second, walk backward at constant speed for half a second.
Which position versus time graph best corresponds with the above velocity versus time graph?
B. The more curvy looking one
The preliminary questions for Lab 3 Newton's Second Law ask you about hitting two balls with a baseball bat, the two ball were a baseball and:
A. A basketball
B. A bowling ball
C. A pin-pong ball
D. A golf ball
B. A bowling ball
During an experiment with projectile motion, the initial velocity of a ball is 5.00 m/s, entirely in the horizontal direction. The ball is launched from an initial height of 2.00 m and lands on the ground. Neglecting air resistance...
How long is the ball in the air?
A. 0.639 s
B. 0.452 s
C. 1.327 s
D. 0.426
A. 0.639 s
During an experiment with projectile motion, the initial velocity of a ball is 5.00 m/s, entirely in the horizontal direction. The ball is launched from an initial height of 2.00 m and lands on the ground. Neglecting air resistance...
How far does the ball travel horizontally?
A. 3.20 m
B. 2.26 m
C. 4.18 m
D. 2.44 m
A. 3.20 m
The maximum speed of an object falling in the presence of air resistance is called:
A. Terminal velocity
B. Ballistic velocity
C. Final velocity
D. Air restricted velocity
A. Terminal velocity
The lab manual claims that air resistance is proportional to:
A. velocity
B. velocity squared
C. A. or B. depending on the situation
D. neither A. nor B.
C. A. or B. depending on the situation
What are the units of a force (in N) versus acceleration (in m/s2) plot?
A. N/m
B. (m/s2)/N
C. kg
D. s
C. 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 the discrepancy?
A. Human error
B. The model F=ma is not exactly true for these experiments.
C. The force probe and accelerometer were not perfectly accurate and there were unaccounted for frictional forces.
C. 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):
A. velocity
B. square root of velocity
C. velocity squared
C. velocity squared
Two sets of coffee filters are falling at terminal velocity. The first set has two filters and takes 2.50 seconds to fall one meter. The second set has 4 filters. How long does it take to fall one meter?
A. 2.50 seconds
B. 1.77 seconds
C. 1.25 seconds
D. Impossible to determine
B. 1.77 seconds
In the centripetal acceleration lab we will measure:
A. The acceleration of an object spinning on a turn table
B. The angular velocity of the turn table
C. The force on the spinning object
D. A and B
E. A and C
F. B and C
G. A, B, and C
D. A. The acceleration of an object spinning on a turn table and B. The angular velocity of the turn table
For the centripetal acceleration lab manual two preliminary questions dealt with:
A. you on a merry-go-round
B. a ball on a string
C. a satellite orbiting the earth
D. None of the above
A. you on a merry-go-round
The graph of centripetal acceleration versus angular velocity was a:
A. Straight line with zero intercept
B. Parabola
C. Natural Log
D. Exponential Decay
B. Parabola
If the angular velocity is kept the same and you move closer to the center of a merry-go-round, the centripetal force required to keep you on the merry-go-round:
A. decreases
B. increases
C. stays the same
D. there's no centripetal force in this case, the force is centrifugal instead
A. decreases
For each question, consider the free-fall portion of the motion of a ball tossed straight upward, starting just as the ball is released to just before it is caught. Assume that there is very little air resistance.
What form or forms of energy does the ball have while momentarily at rest at the top of the path?
A. Potential energy only
B. Kinetic energy only
C. Both kinetic and potential energy
D. Neither kinetic nor potential energy
A. Potential energy only
For each question, consider the free-fall portion of the motion of a ball tossed straight upward, starting just as the ball is released to just before it is caught. Assume that there is very little air resistance.
What form or forms of energy does the ball have while in motion the very instant before it hits the floor?
A. Potential energy only
B. Kinetic energy only
C. Both kinetic and potential energy
D. Neither kinetic nor potential energy
B. Kinetic energy only
During the collision in Lab 7 Ballistic Pendulum, we expect to discover that what quantity is conserved?
A. Total mechanical energy
B. Kinetic energy
C. Potential energy
D. Momentum
D. Momentum
During the subsequent upward swing of the pendulum in Lab 7 Ballistic Pendulum, we expect to discover that what quantity is conserved ?
A. Total mechanical energy
B. Kinetic energy
C. Potential energy
D. Momentum
A. Total mechanical energy
If the total mechanical (kinetic plus potential) energy of the ball in Lab 6 Energy of a Tossed Ball just before it lands is slightly less than just after you threw it we should conclude:
A. The law of conservation of total energy is flawed
B. There were errors in the data collection
C. The equipment is not accurate enough
D. There was a non-conservative force which removed some mechanical energy
D. There was a non-conservative force which removed some mechanical energy (aka air resistance)
Which graph best represents the velocity of a ball thrown straight up in the air while it is in the air.
A. The one that is straight down
Cars have airbags because by using them we can reduce the change in momentum a person has to go through during a crash.
A. True
B. False
B. False
In the impulse-momentum lab, we primarily tested:
A. the equation FΔt = mvf - mvi
B. Whether or not momentum is conserved in collisions.
C. Whether or not momentum is conserved when pulling a cart with a rubber band
D. Whether or not momentum is conserved in an isolated system
A. the equation FΔt = mvf - mvi
In the rotational inertia experiment, a mass is hanging from a string and falls with a relatively small acceleration of 0.1 m/s2. In this case, the tension in the string is equal to the weight of the hanging mass.
A. True
B. False
B. False
What is caused directly and immediately the moment a torque is applied to a rotational object initially at rest? (Pick the best answer only)
A. Rotational displacement
B. Rotational velocity
C. Rotational acceleration
D. Rotational inertia
C. Rotational acceleration
In the angular momentum experiment, what is conserved during the collision between the rolling ball and the rotating platform?
A. Angualr momentum only
B. Angular momentum and linear momentum only
C. Angular momentum and energy
D. Nothing
A. Angualr momentum only
In the angular momentum experiment, how do we determine the initial speed of the launched ball?
A. We use projectile motion to calculate the initial speed
B. We use a photo-gate to measure the initial speed
C. We don't need to determine the initial speed
A. We use projectile motion to calculate the initial speed
For the rotational dynamics lab 9, what pulley radius would produce the most acceleration?
A. the largest
B. the smallest
C. this radius doesn't matter for finding the acceleration
A. the largest
For the rotational dynamics lab last week, what was the magnitude of the downward acceleration of the falling weight that caused the torque?
A. less than gravity (i.e. a = 9.8 m/s2)
B. exactly equal to gravity
C. more than gravity
A. less than gravity (i.e. a = 9.8 m/s2)
Archimedes' principle states that:
A. the buoyant force on an object is equal to the weight of the displaced fluid
B. the change in water pressure between to depths is equal to pgh
C. the pressure added to a fluid in one place increased the fluid pressure over the whole volume
A. the buoyant force on an object is equal to the weight of the displaced fluid
According to the Archimedes' principle lab manual "the ratio of the weight of a given volume of the substance to an equal volume of water" is called the:
A. specific gravity
B. density
C. Archimedes' quotient
D. water ratio
A. specific gravity
For the angular momentum experiment, what kind of collision did you observe?
A. Elastic
B. Partially inelastic
C. Totally inelastic
C. Totally inelastic
According to the law of conservation of angular momentum, what would you expect if a small launcher were placed on a freely-rotating arm with large mass, and it fired a much lighter projectile?
A. The arm would rotate backward at a higher velocity than the projectile
B. The arm would rotate backward at the same velocity as the projectile
C. The arm would rotate backward at a lower velocity than the projectile
D. The arm would not rotate
C. The arm would rotate backward at a lower velocity than the projectile
The impulse applied by a force is equal to:
A. The initial momentum of an object before the force is applied
B. The final momentum of an object after the force is applied
C. The change in momentum
D. The average momentum
C. The change in momentum
Suppose you wanted to deliver the same amount of impulse, but with a force half as large as before. To keep the impulse the same, you should apply the force for:
A. Half as long
B. Twice as long
B. Twice as long
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:
A. True
B. False
A. True
In the ballistic pendulum experiment, the potential energy of the pendulum and ball together when they reach maximum height is equal to the kinetic energy of the ball just before the ball hits the pendulum.
A. True
B. False
B. False