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Quiz C8 Rotational of rigid body

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

Torque is define as cross product between distance, r and __________

a)

energy

b)

velocity

c)

force

d)

displacement

2.

If a system is in static equilibrium, it must have the following 2 conditions:

a)

∑τ=0

b)

Constant acceleration

c)

∑F=0

d)

Positive forces only

3.
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
4.

"Angle undergoes from a fixed reference line" this statement refer to

a)

Average angular velocity, 𝝎_𝒂𝒗

b)

Angular displacement,𝜽

c)

Instantaneous angular velocity, 𝝎

d)

angular acceleration

5.

What is happening to the ice skater?

a)

Decreased Angular velocity, decreased rotational inertia

b)

Decreased Angular velocity, increased rotational inertia

c)

Increased Angular velocity, increased rotational inertia

d)

Increased Angular velocity, decreased rotational inertia

6.

How many radians make up one revolution of 360 degrees?

a)

π/2

b)

π

c)

2π

d)

3π/2

7.

What does Rotational Inertia depend on?

a)

Mass

b)

Mass Distribution

c)

Both Mass and its Distribution

d)

Neither Mass nor its distribution

8.

Angular Momentum is the product of...

a)

rotational inertia and linear velocity.

b)

linear inertia and angular velocity.

c)

linear momentum and angular velocity

d)

rotational inertia and angular velocity.

9.

Which of these items is easier to turn?

a)

Left

b)

Right

c)

Both are just as easy to turn

10.

What happens to rotational inertia of an object when mass is moved close to axis of rotation?

a)

Decreases

b)

Increases

c)

Stays the Same

11.
A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
a)
the moment of inertia of the system increases and the angular speed increases.
b)
the moment of inertia of the system decreases and the angular speed remains the same.
c)
the moment of inertia of the system decreases and the angular speed decreases.
d)
the moment of inertia of the system decreases and the angular speed increases.
12.
What does this formula measure?
a)
moment of inertia
b)
impulse
c)
electric current
d)
angular momentum
13.
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
14.

What force does not cause any torque?

a)

Force perpendicular to the fulcrum.

b)

Force horizontal to the planck.

c)

Force slightly off center of the fulcrum

d)

Forces at a 45 degree angle to the fulcrum, and not on the fulcrum

15.
When an object is experiencing a net torque
a)
it is in dynamic equilibrium.
b)
it is in static equilibrium.
c)
it is rotating.
d)
it is translating.
16.
A construction worker is worried about applying too much torque to a bolt using his wrench.  What could he do to reduce his torque on the bolt?
a)
Increase the length of the wrench
b)
Increase the force on wrench
c)
Reduce the length of the wrench
d)
Reduce the friction between the bolt and wrench
17.
A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?
a)
The larger person moving further away from the center.
b)
Moving the smaller person closer to the center.
c)
Moving the smaller person further from the center.
d)
Making the larger person do nothing.
18.

What is the Unit for Torque

a)

Nm

b)

N

c)

W

d)

J

19.
Which will produce more torque to loosen the lug nut?
a)
A
b)
B
c)
They are the same
20.
A small but hard nut must be crushed.  Which position will require more squeezing force by a hand?
a)
Position A
b)
Position B
c)
It doesn't matter which position the nut is in.

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