Chasing the night away

why does yolanda have trouble sleeping

a a movie scared her

b she is hungry and wants to eat

c her dog will not stop barking

d the moon is shining in her eyes

Were is the question

Exposure to solar flares would be the correct answer

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on