Video Summary

**Newton's third law of motion:** When two objects interact, they exert equal and opposite forces on each other. **Examples:** * When you push a ball, the ball pushes you back with the same force. * When a bird flies, its wings push the air down, and the air pushes the bird up. * When a gun is fired, the gun exerts a force on the bullet, and the bullet exerts an equal and opposite force on the gun. **Why doesn't the gun recoil with the same acceleration as the bullet?** The second law of motion says that the acceleration of an object is equal to the force acting on the object divided by its mass. In this case, the mass of the gun is much greater than the mass of the bullet, so the acceleration of the gun is much less than the acceleration of the bullet.