Final answer:
Friction and gravity are two examples of forces that can change the state of motion.
Step-by-step explanation:
Two examples of forces that can change the state of motion are:
- Friction: Friction is a force that opposes the motion of an object. When a force is applied to overcome friction, it can change the state of motion. For example, when you push a book on a table, the force of friction between the book and the table slows down the book and can eventually bring it to a stop.
- Gravity: Gravity is a force that pulls objects towards each other. It can change the state of motion by accelerating objects towards the Earth's surface. For example, when you drop a ball from a height, gravity pulls the ball downwards and changes its state of motion from being at rest to falling towards the ground.