Cut the Rope is another game that is physics based.
To play, you must cut dangling ropes that hold candy to make the candy fall into the mouth of the cute green monster “Om Nom”. To win the game, you must cut certain ropes in a specific order and at the perfect timing to swing the candy over the monster. There are three stars in each puzzle that you need to collect by swinging the candy into them. You can complete a puzzle without capturing all three stars, but doing so not only increases your score, it also helps unlock future levels.
As you advance to higher levels, things will get more complicated. New challenges will present: elastic ropes that catch your candy, bubbles that float the candy up, air vents that push swinging candy when you tap them, …
Age of kids who can play? I would say 6 and up. Younger kids may still be able to play at the lower levels, but they may not really get the “why” part. It is $0.99 to $3.99 on App Store. There is a lite version if you want to try it out. The 2nd link below is the free version.
Looking for more physics game apps for kids? Check out our picks of 15 Physics Games That Are Safe for Kids to Play