PHYS 2001 Lecture : Chap 4 Notes
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Newton"s laws of motion (cid:1)(cid:2)(cid:3)(cid:4) (cid:5) (cid:6)(cid:1)(cid:7) (cid:7) (cid:5) (cid:8)(cid:9) We have spent two chapters studying kinematics, or motion in and of itself. To do this, we need to develop and understand the concept of force: A force is a push or a pull of one object on another. Two broad categories: contact forces and non-contact forces: all forces have the ability to change the motion of an object. Objects naturally slow down unless a force acts to keep them moving. aristotle (350 b. c. e. ) Objects continue with uniform motion if no external forces act on them. Sir isaac newton: born on christmas 1642 the same year galileo died. Enrolled in trinity college, cambridge, in 1661 when he was 18. If i have seen far, it is because i have stood on the shoulders of giants. Formal statement: in an inertial reference frame, a body remains in a state of uniform motion unless acted on by a net external force.
