WorksheetsRotation Of Rigid Body
Total questions: 20
Worksheet time: 15mins
An angular speed of 40 revolution per minute is equivalent to
2.61 rad/s
4.19 rad/s
382 rad/s
0.07 rad/s
Which of the following is true about a rotating rigid body
Its centre of rotation is at rest
The centre of rotation is at the centre of mass
All points on the body are moving with the same linear velocity
Every points in the body are movng with the same angular velocity
When a ballet dancer outstretch her arms, the angular velocity of the skater decreases
True
False
When the object tends to rotate in a clockwise rotation, the torque is
Positive
Negative
You and a friend are playing on the merry- go-round. You stand at the outer edge of the merry-go-round and your friend stands halfway between the outer edge and the center. Assume the rotation rate of the merry-go-round is constant. Who has the greatest angular velocity?
You
Same
Your friend
You and a friend are playing on the merry- go-round. You stand at the outer edge of the merry-go-round and your friend stands halfway between the outer edge and the center. Assume the rotation rate of the merry-go-round is constant. Who has the greatest tangential velocity?
You
Your friend
Same
How many radians make up one revolution of 360 degrees?
π/2
π
2π
3π/2
The number of complete revolutions per second is:
frequency
period
torque
rotational inertia
A line on which the centers of circles lie is:
lever arm
angular momentum
period
axis of rotation
Which of the following is NOT a unit of rotational speed?
Meters per second
Revolutions per minute
Revolutions per second
Rotations per second
The moment of inertia of a rigid body does depend on the following factors EXCEPT ……
mass
radius
thickness
shape
A body with a definite shape that doesn't change is:
period
angular acceleration
rigid body
radius of gyration
The formula used to find a torque is...
(m)(g)
(F) cos(Ɵ)
(F)(r)( sin θ )
(m)(a)
Conditions for equilibrium are:
1st condition: net force = 0
2nd condition:net torque = 0
True
False
Unit of torque is
Nm
J
N/m
Watt
Condition for maximum torque is
θ = 90 degree
θ =180 degree
θ = 0 degree
not defined
Giving the following image, there are _____ forces acting on the sytem.
3 forces (weight 1, weight 2, and distance 2)
2 forces(weight 1 and weight 2)
1 force (weight 1)
1 force ( weight 2)
The magnitude of the velocity of point P during rotation about a fixed axis is equal to _____________.
v = ωr
v = αr
v = ω2r
v = rω
When there is no external torque acting on a body moving in elliptical path, which of the following quantities remain constant
potential energy
linear momentum
angular momentum
