Hill Climb Racing is a physics based driving game with hours of gameplay.
There are a ton of physics style games out there but much like Flappy Bird, they are overplayed and rarely very good or bring much different. I managed to waste quite a bit of time on this one so I think it is one of the good ones.
Hill Climb Racing Features:
Lots of different vehicles with unique upgrades (many different vehicles: bike, truck, jeep, tank, etc.)
Upgradeable parts include engine, suspension, tires and 4WD
Numerous stages with levels to reach in each (Countryside, Desert, Arctic and the Moon! +++)
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Cool graphics and smooth physics simulation
Designed to look good on low resolution and high resolution devices (incl. tablets)