# Physics Friction Part 5 (Static Friction) Class 8 VIII | Summary and Q&A

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September 24, 2015
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Physics Friction Part 5 (Static Friction) Class 8 VIII

## TL;DR

Friction can be categorized into static friction and sliding friction, which act on objects that are stationary and in motion, respectively.

## Questions & Answers

### Q: What is static friction?

Static friction is the force of friction that acts on objects that are not moving, preventing them from sliding. It opposes the applied force and can only increase up to a certain limit before the object starts moving.

### Q: How does static friction become self-adjustable?

Static friction is self-adjustable because as the applied force increases, the force of static friction also increases. However, it can only increase up to a certain limit before the object starts moving.

### Q: When does static friction cease to exist?

Static friction ceases to exist when the applied force exceeds the limit of static friction, causing the object to start moving. Once the object is in motion, sliding friction comes into effect.

### Q: What is sliding friction?

Sliding friction is the force of friction that acts on objects that are in motion. It opposes the direction of motion and is responsible for slowing down the moving object.

## Summary & Key Takeaways

• Friction can be categorized into two types: static friction and sliding friction.

• Static friction occurs when an object is at rest and there is a force of friction preventing it from moving.

• Sliding friction occurs when an object is in motion, and friction acts in the opposite direction to the applied force.