# easeInQuart constant Null safety

A cubic animation curve that starts slowly and ends quickly. This curve is
based on a quartic equation where `f(t) = t⁴`

.

Animations using this curve or steeper curves will benefit from a longer duration to avoid motion feeling unnatural.

Compared to Curves.easeInCubic, this curve is slightly steeper.

Derived from Robert Penner’s easing functions.

## Implementation

```
static const Cubic easeInQuart = Cubic(0.895, 0.03, 0.685, 0.22);
```