Gravity is something we deal with every day. From pulling that cup of coffee off the table (I swear I didn't push it!) to making our hair flat despite the gratuitous amounts of blow drying we've done, that unseen force of nature exerts its control over every single particle. Naturally, playing games that help us defy gravity gives us a sense of power. So if you're feeling a little slow this fine Monday, grab one of the games below and see if playing with physics can't cheer you up a notch!

Clever Contraptions - Simple physics games work well on small mobile screens, and Clever Contraptions delivers exactly what it promises. Use inventory items to complete simple objectives in each level of the game. Sometimes you need to guide a ball to a basket, other times you have to be a bit more creative and nudge, smash, or press things. No matter the objective, you can drag and drop tools onto the field and rotate them as necessary. Press play, watch what happens, then pause and adjust as necessary. Plenty of levels to keep you puzzling for quite some time, and the free Clever Contraptions Lite lets you get in on the action without parting with your cash.

Chalk Ball - A great physics bouncing game with a lot of attitude and style. It's your job to keep the ball bouncing using lines you draw with your finger. Chalk isn't exactly permanent, though, so you've got to stay on your toes (fingertips?) to make sure your chalk ball stays afloat. Refill your chalk meter and grab other power-ups that float by in the great chalky orb clouds, but be careful to avoid the not-so-power-filled power-ups, as they can make your life rather miserable. The game's sense of humor is great, and the main story mode is actually interesting, unlike most other bouncing/jumping games on the market. The free Chalk Ball Lite is also available.

Pumpkins vs. Monster - A very nice, very unusual sort of puzzle game that feels like a mix of Might and Magic: Clash of Heroes and Plants vs. Zombies. Undead sort of monsters slowly crawl down from the top of the screen. Shielded by a small fence in the middle, you must slide and align pumpkins in groups of three or more to create a projectile. Make a match, flip the group upwards, and watch them crash into the baddies! You occasionally find bonus pumpkins as well as coins, earning a few when you create combos, and cash can be spent in the shop between levels to buy a few items that help you in a tight spot. The game looks great, plays smoothly, and despite suffering from a small lack in variety when compared to the games it emulates, is loads of casual mobile fun.

NOTE: Games listed may not be available outside of North America. Prices are subject to change and are therefore unlisted. Please see the individual game pages for purchasing info. Games have been confirmed to run on Android 2.2 on an HTC Incredible.