Physics 1021 Lecture 2: Physics 1021 – September 22
22 Oct 2016
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Bring the assignment to class or slide underneath the office door. The midterm is a 2-hour exam, should only take 1-hour exam. Scalars are numbers: example: mass = 100kg, example: speed = 5km/h. Vectors are number + direction: example: velocity = 5 km/h [n] Speed is the change in distance over time: by definition: speed = change in distance/time = d/t, v=d/t (speed is detonated by (lower case) v) Unit for speed is m/s in standard units. Ne(cid:449)to(cid:374)"s fi(cid:396)st la(cid:449): an object at rest remains at rest and an object in motion will remain in motion. Building that is at rest on group will stay at rest. Earth moving around sun will remain in motion. If you pull a sheet from under an object, the object will remain at rest: showed paper under a chalk board eraser, the chalk board eraser remained in the same position after the paper was pulled from underneath.
