Need help in Physics 2D

Hello UA,

I am developing a game where I have a penguin that flies up and down the slopes. I want the penguin to move at a decent speed according to the slants of the slope. when it reaches at the peak it falls down and should stay sticked to the ground.

while it is flying the player can tap the screen to bring the penguin down. When the penguin is brought down with the slope and the player leaves the tap, the penguin gets a boost. Please see the image below.

The flight of the penguin is relevant to the speed at exactness of the tap. I have not much idea with unity's physics so please help me with this one.