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WorksheetsChapter 8 Rotational of Rigid Body
Total questions: 19
Worksheet time: 18mins
A body with a definite shape that doesn't change is:
period
angular acceleration
rigid body
radius of gyration
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 moving with the same angular velocity
"Rate of change of angular displacement" this statement refer to
Angular displacement,𝜽
angular acceleration
Average angular velocity, 𝝎_𝒂𝒗
Instantaneous angular velocity, 𝝎
A gear spins at a rate of 400 revolutions/minute. Which choice is closest to its angular speed in radians/second?
63.67 rad/s
41.9 rad/s
3819.71 rad/s
2594.31rad/s
Torque is define as cross product between distance, r and __________
energy
velocity
force
displacement
Unit of torque is
Nm
J
N/m
Watt
Torque depends on
force
moment arm
mass
force and moment arm
All the forces rotating clockwise will have a _______ torque
positive
negative
Condition for maximum torque is
θ = 90 degree
θ =180 degree
θ = 0 degree
not defined
If a system is in static equilibrium, it must have the following 2 conditions:
∑τ=0
Constant acceleration
∑F=0
Positive forces only
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)
What does Rotational Inertia depend on?
Mass
Mass Distribution
Both Mass and its Distribution
Neither Mass nor its distribution
What happens to rotational inertia of an object when mass is moved close to axis of rotation?
Decreases
Increases
Stays the Same
What is happening to the ice skater?
Decreased Angular velocity, decreased rotational inertia
Decreased Angular velocity, increased rotational inertia
Increased Angular velocity, increased rotational inertia
Increased Angular velocity, decreased rotational inertia
