Apassenger sitting in the rear of a bus claims that he was injured when the driver slammed on the brakes, causing a suitcase to come flying toward the passenger form the front of the bus. if you were the judge in this case, what disposition would you make

If I will be the judge, the passenger will not be injured by suitcase came from the front of the bus because when the driver slammed the break the inertia of the force must be moving forward. It impossible for a suit case to move backwards, maybe the passenger was the one flying forward and hit something 

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.