2. Apply Newton's second law to calculate the frictional force needed to hold a 15 g pen in your fingers and keep it from falling. (g = 9.8 m/s2)

0.147N

Explanation:

F = m( v-u )

t

This rewritten as

F = ma

For the pen to be held without falling , the frictional force must be equal to the force that would bring the pen down.

a

explanation:

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.