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WorksheetsDP014: C7 ROTATION OF RIGID BODY
Total questions: 23
Worksheet time: 46mins
Torque is define as cross product between distance, r and __________
energy
velocity
force
displacement
Condition for maximum torque is
θ = 90 degree
undefined=180 degree
undefined= 0 degree
not defined
All the forces rotating clockwise will have a _______ torque
positive
negative
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
"Rate of change of angular displacement" this statement refer to
Angular displacement,𝜽
angular acceleration
Average angular velocity, 𝝎_𝒂𝒗
Instantaneous angular velocity, 𝝎
"Angular acceleration at a specified position or at a particular of time" this statement refer to
Average angular velocity, 𝝎_𝒂𝒗
Angular displacement,𝜽
Instantaneous angular acceleration, 𝜶
Instantaneous angular velocity, 𝝎
An object is moving with uniform speed in a counterclockwise, horizontal circle. Which of the following images correctly depicts the force vector and velocity vector at a point in time.
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
The value of torque depends on the rotation axis and the _______________________
magnitude of applied force.
mass of object
moment inertia of object
shape of object
Find the angular displacement of the wheel after a duration of 1.5 s if the initial angular speed and angular acceleration are 0.6 rad s-1 and 1.0 rad s-2.
3 rad
2 rad
1 rad
4 rad
Find the linear displacement of the 2 m radius wheel after a duration of 3 s if the initial angular speed and angular acceleration are 0.5 rad s-1 and 1.5 rad s-2.
16.5 m
8.3 m
33 m
4.2 m
The linear velocity of the moving 3 cm radius ball after 5 s is 0.1 m s-1. Find the initial angular speed of the ball if the angular acceleration is 0.01 rad s-2.
3.3 rad s-1
0.4 rad s-1
2.6 rad s-1
5.7 rad s-1
The final angular velocity of a moving wheel barrel is 30 rad s-1. Find the initial angular speed if the angular acceleration and the angular displacement are 10 rad s-2 and 45 rad respectively.
start from rest
20 rad s-1
3 rad s-1
0.5 rad s-1
An airplane blades are rotating with an angular velocity of 110
rad/s. As the plane takes off, the angular velocity of the
blades reaches 330 rad/s in a time of 14 s. Find the
average angular acceleration.
20.3 rad s−1
15.71 rad s−1
2.31 rad s−1
6.32 rad s−1
A fan blade with radius 0.6 m has an angular speed of 6.50 rad/s. Calculate its linear speed.
10.83 ms-1
0.09 ms-1
3.9 ms-1
17.32 ms-1
Helicopter blade has a radius of 7 m and
has an angular acceleration of 1.30 rad s-2 . Calculate its tangential acceleration.
23.33 ms-2
0.04 ms-2
1.32 ms-2
9.1 ms-2
A spinning top rotates at radius of 0.2 m and have an angular velocity of 1.2 rad s-1. Calculate its centripetal acceleration.
29 rad s-2
2.9 rad s-2
0.24 rad s-2
0.29 rad s-2
ω = ωo +∝t Which rotational motion equation is similar with linear motion equation ?
v = u + at
s = ut + 21at2
v2 = u2 + 2as
v = u + ∝t
A wheel turns about its axis of rotation at uniform angular acceleration from the rest. Calculate the angular displacement after 4 s when the angular acceleration of the wheel is 1.5 rad s-2.
12 rad
10 rad
20 rad
11 rad
A disc is rotated from rest with an angular velocity of disc is 7.5 rad s-1 and rotates 22 rad. Calculate the angular acceleration of the disc.
1.28 rad s-2
2.55 rad s-2
5.11 rad s-2
10.23 rad s-2
