Main content

# Unit 12: Why do helicopters have a second rotor on the tail?

1,300 possible mastery points

Mastered

Proficient

Familiar

Attempted

Not started

Quiz

Unit test

### Learn

### Practice

- Angular and tangential accelerationGet 3 of 4 questions to level up!
- Using rotational kinematic formulasGet 3 of 4 questions to level up!

### Learn

### Practice

- Calculating torqueGet 3 of 4 questions to level up!
- Equilibrium and applied force Get 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Torque and angular accelerationGet 3 of 4 questions to level up!
- Predicting rotational inertia Get 3 of 4 questions to level up!
- Angular acceleration and angular second lawGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Practice

- Rotational kinetic energyGet 3 of 4 questions to level up!

### Learn

### Practice

- Angular momentum calculationsGet 3 of 4 questions to level up!
- Angular impulse calculationsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Conservation of angular momentumGet 3 of 4 questions to level up!
- Predicting changes in momentum during collisionsGet 3 of 4 questions to level up!
- Conservation of angular momentum calculationsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

Up next for you:

Level up on all the skills in this unit and collect up to 1300 Mastery points!