Backwards, compared to you if you are seated or using the handle bar. Break it down to where you can understand it, I had a great study buddy for physics, she was a stripper, but she was so smart at book concepts. She told me to understand things in simpler context.
What if you have a coffee in your hand. You pull forward to cut in front of the traffic, what does that coffee do? It spills back onto your great blouse you had picked out for that day. Same thing with your item on the bus.
Physics was great, it was about how thing really act and then you apply the equations to what actually happens......for instance, did you know that when drive at nite, you outdrive your headlights at speeds of over 20 mph. Brights do nothing for you, you can't stop in time for something you see if you are going over 20 mph in the dark.....Very interesting, but I also had a great physics teacher
My stripper buddy would compete with me whoever had the better grade on tests got to have the other as a personal slave........I spent a lot of time rubbing her feet and lotioning her, but I did learn a lot, too. I loved physics, both because of the great teacher and my study budy and our competitions with each other.