When solving the complicated problem of the yo-yo, how did Professor Geller approach the problem to make it easier? a. He neglected the linear portion of motion-it doesn't matter
b. He split up the motion of the yo-yo into linear and rotational parts
c. He tried to solve rotational and linear motion in the same equation
d. He neglected the rotational portion of motion--it doesn't matter

Friction is the force that act and opposes all motion of moving objects

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.

The answer would be a