A ball is rolling in a straight line at a constant speed. Another ball is motionless. what do they have in common?
They are both balls.
They both have inertia.
There is no acceleration so no horizontal force.
The two balls have several things in common:
1. They both have mass: Both the rolling ball and the motionless ball have mass. Mass is a measure of the amount of matter in an object.
2. They both occupy space: Both balls take up physical space. They have a certain volume that is determined by their size and shape.
3. They both experience gravitational force: Both balls are subjected to the force of gravity. The force of gravity attracts objects with mass towards each other.
4. They both possess inertia: Both balls exhibit the property of inertia, which is the resistance of an object to changes in its state of motion. The rolling ball maintains its constant speed due to its inertia, while the motionless ball remains motionless due to its inertia.
5. They both exist in the physical world: Both balls exist in the same physical reality and are subject to the laws of physics that govern the behavior of objects in our universe.
To determine these commonalities, one can observe and analyze the properties and behaviors of the balls, considering concepts such as mass, space, gravity, and inertia, which can be studied through physics principles and experiments.