NEW
Font size
WorksheetsRotational Kinematics
Total questions: 40
Worksheet time: 1hrs 8mins
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
The inside horse
The outside horse
Neither - they both have the same angular speed
A gear spins at a rate of 400 revolutions/minute. Which choice is closest to its angular speed in radians/second?
6.67 rad/s
2500 rad/s
41.9 rad/s
20.9 rad/s
Two bugs ride a turntable which is rotating at a constant rate of 4 rad/s. Bug B is at a radius of 4 cm, while bug A is at a radius of 8 cm. Which of the following is true?
Bug A has a greater rotational speed.
Bug B has a greater rotational speed.
Bug B has a greater speed.
Bug A has a greater speed.
An object moves in a circle at a constant speed. Which of the following is NOT true f the object?
its centripetal acceleration points toward the center of the circle
its tangential speed is constant
its velocity is constant
a centripetal force acts on the object
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is the time interval required for it to reach a 4.2 rad displacement after starting from rest
1.8 s
2.0 s
16 s
18 s
A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
9.6 rad/s/s
4.8 rad/s/s
3.1 rad/s/s
1.6 rad/s/s
A 0.30m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s2 over a 5.0 s interval?
125 rad
25 rad
2 rad
0.5 rad
As a young boy swings a yo-yo parallel to the ground and above his head, the yo-yo has a centripetal acceleration of 250 m/s^2. If the yo-yo’s string is 0.50 m long,what is the yo-yo’s tangential speed?
11 m/s
15 m/s
112 m/s
22 m/s
In order to do a lot of flips an Olympic diver would want:
A high rotational inertia
A low rotational inertia
A low linear acceleration
A low angular velocity
When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?
To change the mass of your body
To be ready to grab something in case you fall
To look good
To change the center of gravity of your body and the load
Torque is the product of a force exerted on an object times the length of the lever arm.
True
False
In order for a seesaw to be in rotational equilibrium, the sum of the torques acting on it have be balanced.
True
False
A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.
True
False
The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is
Friction
his weight
the normal force
none of the above
If the translational velocity of an object is 3 m/s, and is located a distance of 2 m from the axis of rotation, what is the object's angular velocity?
0.67 rad/s
1.5 rad/s
1 rad/s
6 rad/s
Which would have a greater linear velocity?
Kid near the center of the merry go round
Kid near the outside of the merry go round
neither
Which of the following is NOT a unit of rotational speed?
Meters per second
Revolutions per minute
Revolutions per second
Rotations per second
Which will produce more torque to loosen the lug nut?
A
B
They are the same
A wrench is used to tighten a nut. A 15N perpendicular force is applied 5m away from the axis of rotation as it turns. What is the torque applied to the wrench?
75 Nm
1.5 Nm
750 Nm
150 Nm
A solid sphere, solid cylinder, and a hollow hoop all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
cylinder
hoop
sphere
They all reach the bottom at the same time.
The drive chain in a bicycle is applying a torque of 0.850 N ∙ m to the wheel of the bicycle. You can treat the wheel as a thin uniform hoop (or ring) with a mass of 0.750 kg and a radius of 33.0 cm. What is the angular acceleration of the wheel?
10.4 rad/s²
3.43 rad/s²
5.20 rad/s²
1.06 rad/s²
An object completes 1.5 circular orbits in half a minute. What is its approximate angular velocity?
0.05 rad/s
0.31 rad/s
0.5 rad/s
31 rad/s
Which of the following is NOT a unit of rotational speed?
Meters per second
Revolutions per minute
Revolutions per second
Rotations per second
An automobile (2000 kg) travels around a circular track of radius 430 m at a speed of 22 m/s. What is the coefficient of friction needed to keep this car on the track?
1.15
0.115
0.23
0.023
Moment of inertia is the resistance to change in...
movement
rotation
none of these
A model airplane is guided in a horizontal circular path by a cord of length 16 m. If it has a constant speed of 18 m/s and a mass of 200 g, what is the tension in the cord?
4.5 N
9.1 N
4.05 N
405N
An automobile travels around a circular track of radius 0.120 km at a speed of 2.5 m/s. What is the centripetal acceleration?
2600 m/s2
0.26 m/s2
0.0052 m/s2
0.052 m/s2
A Lincoln Continental and a VW Beatle are making a turn. The Lincoln is four times more massive than the Beatle. If they make the turn at the same speed, then how do the centripetal forces acting on the two cars compare?
Lincoln is four times bigger
Lincoln is two times smaller
Lincoln is sixteen times bigger
Lincoln is four times smaller
The Earth completes one of these every 365.25 days
rotation
revolution
An industrial flywheel has a greater rotational inertia when most of its mass is
nearer the axis
uniformly spread out as in a disk
nearer the rim
A flywheel's diameter is twice that of another of the same shape and mass. Roational inertia of the larger flywheel is
two times greater
four times greater
the same as the other
half that of the other
A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first?
disk
ring
sphere
all reach the bottom at the same time
A torque acting on an object tends to produce
a center of gravity
rotation
linear motion
equilibrium
velocity
A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy?
0.92 J
17 J
1.1 J
0.18 J
