Ball of Slopetelling

This ball has a red underside and a blue upside. It weighs 5 pounds and has a 5 inches diameter. As an action, you can utter the word "ball" to activate it and place its red side on any solid surface. Once activated, it will roll down any slope it is on (if any) for one round (6 seconds). Use its weight and volume in relation to the incline of the slope to calculate how far it will travel for a single round under the effects of regular gravity. After the round, it automatically stops. 

The ball will not roll if the activating word is not uttered, but can still be moved and picked up in its unactivated state. A creature can use an action to make a DC 25 Strenght check, rolling the ball up to 10 feet on a success.