1. Gravity: Gravity pulls the snowball down the slope, causing it to accelerate and gain speed. The steeper the hill, the greater the force of gravity acting on the snowball, resulting in faster acceleration.
2. Friction: The rolling snowball experiences friction from the grass and other irregularities on the hill's surface. This frictional force opposes the motion of the snowball, causing it to slow down. The rougher the surface, the greater the friction, and the more significant the snowball's deceleration.
3. Air Resistance: As the snowball rolls, it encounters resistance from the air. Air resistance increases as the snowball's speed increases. This opposing force acts to slow down the snowball, especially at higher speeds.
4. Snow Accumulation: As the snowball rolls downhill, it collects more snow, increasing its mass. The increased mass results in greater inertia, making it harder for the snowball to accelerate or decelerate. This effect becomes more significant as the snowball rolls further and accumulates more snow.
5. Shape and Surface: The shape and surface of the snowball can also influence its speed and deceleration. A more spherical snowball experiences less resistance from the air and rolls more smoothly, leading to higher speeds. A snowball with an irregular shape or a rough surface encounters more friction and air resistance, causing it to slow down more quickly.
Ultimately, the net force acting on the snowball determines whether it speeds up or slows down. If gravity and the slope's incline are more influential than friction and air resistance, the snowball accelerates. Conversely, if friction and air resistance are more significant, the snowball decelerates. These factors combine to create the snowball's rolling motion down the grassy hill.
