# Torque | Summary and Q&A

8.3K views
December 30, 2013
by
MIT OpenCourseWare
Torque

## TL;DR

This video explains the concept of torque and its relationship with balance, using examples and diagrams to illustrate the principles involved.

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### Q: Why is it easier to push over one person standing in a certain way compared to another person?

The ease of pushing someone over depends on their center of mass and how their body is positioned. If the center of mass is located farther away from the base of support, it becomes easier to create torque and topple the person.

### Q: How can representations, such as diagrams and models, help us understand torque and balance better?

Representations provide visual and spatial information that can enhance our understanding of abstract concepts. Diagrams and models allow us to analyze and manipulate torque vectors and forces, making it easier to grasp the underlying principles.

### Q: Can you explain how torque is calculated and represented in a diagram?

Torque is calculated by multiplying the length of the lever arm (perpendicular distance from the axis of rotation to the line of force) by the magnitude of the force. In a diagram, torque vectors are typically represented by arrows perpendicular to the plane of rotation, with the length of the arrows depicting the magnitude of the torque.

### Q: How does torque influence balance in the human body?

Torque plays a crucial role in maintaining balance in the human body. When various forces act on different parts of the body, the net torque should be zero for the person to remain balanced. A shift in torque can cause the person to lose balance and topple over.

## Summary & Key Takeaways

• Torque is a concept that explains why it is easier to push over someone standing in a certain way compared to another person.

• The video introduces the idea of representations and how different ways of representing information can enhance understanding.

• The video provides an activity for students to explore torque and balance, encouraging them to think scientifically about where to push and in what direction.