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# restitution

A factor that determines how much kinetic energy the body loses or gains in collisions.

```
var restitution: CGFloat { get set }
```

## Discussion

This property simulates the “bounciness” of a body. A restitution of `1.0` means that the body loses no energy in a collision—for example, a ball dropped onto a flat surface will bounce back to the height it fell from. A restitution of `0.0` means the body does not bounce after a collision. A restitution of greater than `1.0` causes the body to gain energy in collisions. The default restitution is `0.5`.

---

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