GrayceBailin
7

# what happens to the kinetic energy of a snowball as it rolls across the lawn and gains mass.

The kinetic energy of an object is $\frac{1}{2} mv^2$ where m is the mass of the object and v is the velocity. If you roll a snowball downhill, gravity accelerates the object and v increases. This causes the kinetic energy of the object to increase as well. If you roll a snowball on level ground or uphill, friction will cause the velocity to decrease. Thus kinetic energy will decrease as well.