WorksheetsRotational Dynamics
Total questions: 11
Worksheet time: 9mins
When would a force applied to a rigid body lead to zero torque?
When the force is directed towards or away from the axis of rotation.
When the force is applied perpendicular to the lever arm
When the force is a gravitational force
When the force is a normal force
If an object is moving in a circle of radius r with a constant speed v, what is its angular velocity?
Hint: v = rω
v2 / r
vr
v / r
r / v
A disk rotates with an angular speed (ω). What is the magnitude of the tangential velocity (v) of a point on the disk located a distance (r) away from the axis of rotation?
Hint: Check your notes from Week 22. Go to the section titled, "Angular Speed and Tangential Speed."
ωr
rω
ωr
ω2r
What is Klyde's angular velocity?
The same as Bonnie's
Twice Bonnie's
Half of Bonnie's
1/4 Bonnie's
What is happening to the ice skater as she brings her leg closer to her torso?
Hint: α = τ / I
and
I = Σmiri2
Decreased angular velocity, decreased moment of inertia
Decreased angular velocity, increased moment of inertia
Increased angular velocity, increased moment of inertia
Increased angular velocity, decreased moment of inertia
The graph above shows the angular velocity (ω) of an object with respect to time.
During which time intervals is there a net torque (τnet) on the object? Select all that apply.
0-2s
2-6s
6-8s
8-10s
What is Klyde's tangential velocity (v)?
Hint: v = rω
The same as Bonnie's
Twice Bonnie's
Half of Bonnie's
1/4 Bonnie's
A force (F) is applied to a wrench to turn a bolt. The moment of inertia (I) is given for the different bolts.
Which of the following bolts has the greatest angular acceleration (α)?
Hint: α = τ / I = F⟂r / I
F
A
B
E
C
A force (F) is applied to a wrench to turn a bolt. The moment of inertia is given for each bolt.
Which of the following bolts has the greatest torque? Select all that apply.
Hint: τ = F⟂r
E
B
C
D
F
Does this result make sense? If yes then why? if no, then Why not?
What happens to his moment of inertia (I) when the figure skater brings in his arms?
Hint: I = Σmiri2
His moment of inertia increases
His moment of inertia decreases
He has no effect on his own moment of inertia
