What is the gravity for the sprite in Unity 2d

Questions & Answers
1

I create a scene with two objects in a Unity 2d project (unity 4.3.1). One is a sphere and the other is a sprite. And I set both of them as Rigidbody 2D. Then I play it. The sphere object falls correctly but the sprite just floats in the sky like a balloon unless I set the gravity to 10. Why like this? Can anybody tell me the difference between an normal object (cube, sphere) and a sprite? Why the gravity of the sprite seems to be not correct? Thanks

2

I found the reason. I should uncheck the “Apply Root Motion”.