# Does Static Friction exist? | Physics | Don't Memorise | Summary and Q&A

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September 4, 2017
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Infinity Learn NEET
Does Static Friction exist? | Physics | Don't Memorise

## TL;DR

Friction can prevent objects from moving when an external force is applied, and it comes in different types depending on the relative motion between objects.

## Key Insights

• 🤳 Static friction is a self-adjusting force that increases as the applied force increases until the object starts moving.
• 😥 The transition from static to sliding friction is known as the breakaway point.
• 😘 Sliding friction is generally lower than static friction, making it easier to push objects once they are in motion.
• 🤣 Rolling friction is encountered when one object rolls over another.
• 🖐️ Friction plays a crucial role in determining an object's motion and stability.
• 🅰️ Different types of friction can be observed depending on the relative motion between objects.
• 🧑‍🏭 The force of friction opposes the applied force and acts in the direction opposite to the motion.

## Transcript

I ended the previous lesson with a question I asked you if the force of friction comes into play only when the two things are in relative motion let's discuss this in detail let's say you want to move the stationery sofa in your living room and the sofa is really heavy what happens when you give it an initial push yes you're right nothing happens t... Read More

### Q: Why doesn't a stationary sofa move even with an initial push?

The force of static friction balances the force you apply, preventing the sofa from moving. This force opposes the direction of your push and adjusts based on the applied force.

### Q: What happens to the static force when the sofa starts moving?

When the sofa starts moving, the static friction ends, and the sliding friction takes over. The force of sliding friction is generally lower than the maximum static friction force.

### Q: How do static, sliding, and rolling friction compare in terms of force applied?

In increasing order of force applied, it goes: rolling friction, sliding friction, and static friction. Static friction has the highest force because it prevents motion.

### Q: Does friction only occur between solid objects?

Based on the examples discussed, friction primarily occurs between solid parts. However, there may be other types of friction that haven't been covered yet.

## Summary & Key Takeaways

• Static friction is the force that opposes motion between stationary objects, and it increases as the applied force increases until the threshold is reached.

• Sliding friction occurs when an object starts moving, and the force of friction remains relatively constant.

• Rolling friction is the resistance encountered when one object rolls over another.