If you want it to go uphill, you'll need to either add force or impulse.
https://www.scirra.com/manual/98/physics
[quote:3d57i5m2]Apply force
Apply force at angle
Apply force towards position
Apply a force on the object, either at an angle, towards a position, or with custom X and Y axis forces. Applying a force causes the object to accelerate in the direction of the force. Forces can be applied from an image point or the object's origin.
Apply impulse
Apply impulse at angle
Apply impulse towards position
Apply an impulse on the object, either at an angle, towards a position, or with custom X and Y axis impulses. Applying an impulse simulates the object being struck, e.g. hit by a bat. Impulses can be applied from an image point or the object's origin.