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Total questions: 14
Worksheet time: 13mins
A CD is rotating clockwise about its center as shown. At the instant shown, the CD has increasing angular velocity and is playing the hit song “The Wheel in the Sky” by the iconic 80’s arena rock band, Journey. Point Q is on the rim of the CD and point P is one half radius from the disc’s center. Which of the statements bellow is necessarily true?
In one rotation, both points have the angular displacement.
In one rotation, both points travel the same distance.
Point P is traveling faster than point Q.
Both have points have the same centripetal acceleration.
A bullet hits a wood rod that is pivoted on its left end shown. Consider 3 different cases i) the bullet hits the rod and bounces off the rod and rebounds in the opposite direction, ii) the bullet becomes embedded with the rod and swings with the rod and iii) the bullet goes through the rod. In which case does the rod have the greatest angular velocity after interacting with the bullet?
When the bullet bounces off the rod and rebounds.
When the bullet is embedded in the wood rod.
When the bullet goes through the rod.
The rod will have the same angular velocity in all 3 cases.
A student conducts an experiment to determine the relationship between applied torque and change in angular velocity. The student uses the apparatus shown, consisting of two discs that are attached together and mounted on an axle. Blocks of varying mass as hung from a string wound around the smaller disk. The blocks are released from rest. For each block, the final speed after falling is measured. There is friction between the disk and the axle. Which of the following best represents a plot that can obtained form the student’s data?
In each case shown below, a 1.0 kg object is launched up an incline with an initial speed of v = 10 m/s. Both spheres roll without slipping, and the blocks slide without friction. The ramps are identical in case A and D. Ramp C is steeper than ramp B. Rank the maximum height reached by the objects.
A > D > (B = C)
(B = C) > D > A
D > A > (B = C)
(A = D) > (B = C)
Leia and Luke are on a rotating merry-go-round. Leia is on the outer edge, while Luke is halfway between the edge and the center. How does Leia’s linear speed compare to that of Luke’s?
Her linear speed is four times as much.
Her linear speed is twice as much.
Her linear speed is the same.
Her linear speed is half as much.
A bowling ball rolls without slipping across a horizontal surface. Which of the following is true of the work done by friction on the bowling ball while it rolls?
The net work done by friction is positive since friction converts the ball’s rotation into linear motion.
The net work done by friction is negative since friction always acts against relative motion.
The net work by friction is zero since it does positive rotational work and negative linear work.
The net work by friction is positive since friction acts in the direction of relative motion.
A horizontal, 10-m plank weighs 100 N. It rests on two supports that are placed 1.0 m from each end as shown in the figure above. How close to one end can an 800-N person stand without causing the plank to tip?
0.3 m
0.5 m
0.7 m
0.9 m
A ball, rolling without slipping on a horizontal surface, encounters a frictionless, downward sloping ramp, as shown above. Which of the following correctly describes the motion of the ball on the ramp?
Increasing translational speed with no angular speed
Increasing translational speed with constant nonzero angular speed
Increasing translational speed with decreasing angular speed
Increasing translational speed with increasing angular speed
Two masses of mass 10 and 6 kg are hung from massless strings at the end of a light rod. The rod itself is virtually weightless. A pivot is placed off center and the system is free to rotate. What is the distance of the 10 kg mass to the pivot?
0.42 m
4.8 m
6.3 m
2.4 m
A large star spins about an axis at its center of mass. The star begins to collapse due its own immense gravity, which causes its radius to decrease. Which of the following describes the change in momentum and angular speed of the star?
The star’s momentum and angular velocity will both increase.
The star’s momentum will remain the same; its angular velocity will decrease.
The star’s momentum will remain the same; its angular velocity will increase
The star’s momentum will decrease; its angular velocity will increase.
The figure shown above represents a stick of uniform density that is attached to a pivot at the right end and has equally spaced marks along its length. Any one of the four forces shown can be exerted on the stick as indicated. Which force will create the largest rate of change in the stick’s angular momentum?
The 30 N force
The 40 N force
The 60 N force
The 150 N force
The figure above shows a rod that is fixed to a horizontal surface at pivot P. The rod is initially rotating without friction in the counterclockwise direction. At time t, three forces of equal magnitude are applied to the rod as shown. Which of the following is true about the angular speed and direction of rotation of the rod immediately after time t?
Angular Speed - Decreasing
Direction of Rotation - Counterclockwise
Angular Speed - Decreasing
Direction of Rotation - Clockwise
Angular Speed -Increasing
Direction of Rotation - Counterclockwise
Angular Speed - Increasing
Direction of Rotation - Clockwise
A wheel (I=1/2 M R^2) rolls w/o slipping on a flat surface. What percent of its total kinetic energy is rotational kinetic energy?
33
40%
50%
67
Which of the following is a physics?
F=ma
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