Check out SpaceForce, a physics game using force, motion, and mass to recover lost riches. Use the mouse cursor to highlight any of the objects located in the blue palette window at the top of the level. Click and hold the Left-Mouse Button to pick up the object. Move the mouse around while continuing to hold the Left-Mouse Button to move the object around the level.
Release the Left-Mouse Button while on top of one of the highlighted placement markers in the level (highlighted placement markers will glow green when you are close enough to drop an object). After placing your object, click the ‘Play’ button in the top left of the level to set the object in motion.