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Torque and Rotation Review

Torque and Rotation Review

Assessment

Presentation

Physics

11th Grade

Medium

NGSS
HS-PS2-1, MS-PS2-2, HS-PS2-2

+1

Standards-aligned

Created by

g Custer

Used 54+ times

FREE Resource

6 Slides • 17 Questions

1

Torque and Rotation Review

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2

7.1 Rotational Kinematics

  • Describes the motion of rotating objects.

  • We assume a constant angular acceleration.

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3

Multiple Choice

A disc rotates through 20 rotations in 5 seconds. If the disc starts from rest, what is the angular velocity?
1
5 rotations/s
2
100 rotations/s
3
4 rotations/s
4
10 rotations/s

4

Multiple Choice

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What happens to the angular velocity when a figure skater brings in their arms?

1

Increases her angular velocity

2

Decreases her angular velocity

3

Has no affect

5

Multiple Choice

Which statement is true about an object that is traveling in uniform circular motion?

1

The speed of the object varies.

2

The net force on the object is directed toward the center of the circular path.

3

The direction of the object's velocity is constant.

4

The net force on the object is directed away from the center of the circular path.

6

Multiple Choice

Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
1
The inside horse
2
The outside horse
3
Neither - they both have the same angular speed

7

Multiple Choice

A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record.
1
True
2
False

8

7.2 Torque and Angular Acceleration

  • Torque is the rotational equivalent to a Force. A net torque applied on an object will cause the object to change its rotational motion. 

  • If all the torques on an object are balanced (∑𝜏 = 0) then the object is in equilibrium.

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9

Multiple Choice

When solving a torque problem, all lever arms are measured from the

1

end of the bar

2

pivot or fulcrum

3

center of the bar

4

center of the mass

10

Multiple Choice

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Does a bridge anchored resting on two pillars have any torque?

1

No, it isn't moving

2

Yes, but it is at equilibrium

3

Yes, but it will soon break because of the torque

4

No, Bridges can't have torque

11

Multiple Choice

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A state of equilibrium is also seen below. Each of the cars weighs the same 9800 N. Despite the fact that there is only one car on the left-hand side that is 9 m from the fulcrum, the torques balance because, the cars on the right-hand side, are ____meters from the fulcrum, compared to the car on the left-hand side.

1

4.5 m

2

3 m

3

1 m

4

2 m

12

Multiple Choice

You apply force to a wrench to tighten a bolt. The wrench breaks in half. Select the best answer for what happens next. Assume the force applied remains constant.

1

The torque is now half of what it was, because torque and distance are inversely proportional

2

The torque is now half of what it was, because torque and distance are directly proportional

3

The torque is now double of what it was, because torque and distance are inversely proportional

4

The torque is now double of what it was, because torque and distance are directly proportional

13

Multiple Choice

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Will the torque be increased by using the rope?
1
A - Yes
2
B - No

14

Multiple Choice

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What is the weight of the package?
1
5 N
2
10 N
3
15 N
4
20 N

15

Multiple Choice

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A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

1

The larger person moving further away from the center.

2

Moving the smaller person closer to the center.

3

Moving the smaller person further from the center.

4

Making the larger person do nothing.

16

7.3 Angular Momentum

  • L is the angular momentum, I is the moment of inertia of the object, and 𝜔 is the angular velocity of the object.

  • A net torque causes a change in the angular momentum of the object.


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17

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18

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19

Multiple Choice

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According to the Law of Conservation of Angular Momentum, if I (momentum of inertia) increases, what will happen to ω?

1

Decrease

2

Stay the same

3

Increase

20

Multiple Choice

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Which of these items is easier to turn?

1

Left

2

Right

3

Both are just as easy to turn

21

Multiple Choice

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

1

Decreases

2

Increases

3

Stays the Same

22

Multiple Choice

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A skater start spinning on the tips of her skates at low angular velocity with arm outstretched.

What would happen when she brings her arms close to her body

1

She will spin slower

2

She will spin faster

3

She will spin at the same velocity

23

Multiple Choice

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What is happening to the ice skater?

1

Decreased Angular velocity, decreased rotational inertia

2

Decreased Angular velocity, increased rotational inertia

3

Increased Angular velocity, increased rotational inertia

4

Increased Angular velocity, decreased rotational inertia

Torque and Rotation Review

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