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A4 Rigid body mechanics summary

Total questions: 25

Worksheet time: 23mins

Name
Class
Date
1.

Which angular measurement is equivalent to the translational measurement of Force?

a)

Moment of Inertia

b)

Torque

c)

Angular Accelertation

d)

Angular Momentum

2.

Which measurement is the angular equivalent to mass?

a)

Moment of Inertia

b)

Torque

c)

Angular Acceleration

d)

Angular Momentum

3.

As a yo-yo is thrown downward and then climbs back up, at what point is its total mechanical energy at a maximum?

a)

Top

b)

Half way down

c)

Bottom

d)

All points are the same

4.

As a child on a merry-go-round walks from the outer edge toward the center, what happens to the angular momentum of the child and merry-go-round system?

a)

Increases

b)

Decreases

c)

Remains Constant

5.

What is measured in radians?

a)

angular displacement

b)

angular acceleration

c)

angular velocity

d)

angular momentum

6.

What is measured in radians per second?

a)

angular displacement

b)

angular acceleration

c)

angular velocity

d)

rpm

7.

What is the unit for angular momentum,L?

a)

Kg m2s-1

b)

Nm

8.

What is the unit for rotational inertia, I,?

a)

Nm

b)

Nm-1

c)

rad s-2

d)

kg m2

9.

What is torque, τ, measured in?

a)

Newton metres

b)

radians per second

c)

radians per second squared

d)

Newtons per degree

10.

What is the unit for angular acceleration

a)

radians

b)

rad s-1

c)

rad s-2

d)

degrees

11.
A Ferris wheel starts at rest and builds up to a final angular speed of 0.70 rad/s while rotating through an angular displacement of 4.9 rad. What is its average angular acceleration?
a)
0.01 rad/s/s
b)
0.05 rad/s/s
c)
1.8 rad/s/s
d)
2.6 rad/s/s
12.
A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s2. What is its angular speed after this 7-s interval?
a)
0.2 rad/s
b)
0.3 rad/s
c)
0.46 rad/s
d)
0.78 rad/s
13.
The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?
a)
A
b)
B
c)
C
d)
D
14.
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
a)
The inside horse
b)
The outside horse
c)
Neither - they both have the same angular speed
15.
A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?
a)
7.5 Nm
b)
1.5 Nm
c)
750 Nm
d)
150 Nm
16.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
17.
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
a)
her moment of inertia increases and her angular speed decreases.
b)
her moment of inertia decreases and her angular speed increases.
c)
her moment of inertia increases and her angular speed increases.
d)
her moment of inertia increases and her angular speed remains the same.
18.
Which of these gives rotational kinetic energy?
a)
a
b)
b
19.
What does this formula measure?
a)
moment of inertia
b)
impulse
c)
electric current
d)
angular momentum
20.
According to the Law of Conservation of Angular Momentum, if I (momentum of inertia) increases, what will happen to ω?
a)
Decrease
b)
Stay the same
c)
Increase
21.

The angular momentum of an object changes from 9.0 𝑘𝑔𝑚!/𝑠 to 6.0 𝑘𝑔𝑚!/𝑠 in 10 s. What is the torque causing the change?

a)

0.3 Nm

b)

1.3Nm

c)

2.5Nm

d)

4.1Nm

22.

J=Ft=mΔVJ=Ft=m\Delta V  What is the change in momentum of a 3 kg object accelerating from rest to 12 m/s?

a)

15 kgm/s

b)

0.25 kgm/s

c)

4 kgm/s

d)

36 kgm/s

23.

what is the area below the graph

a)

angular momentum

b)

angular acceleration

c)

angular velocity

d)

angular impulse

24.

what is the area below the graph

a)

angular displacement

b)

angular velocity

c)

angular acceleration

d)

angular momentum

25.

what is the gradient of the graph

a)

angular displacement

b)

angular velocity

c)

angular acceleration

d)

angular momentum

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