PHYSICS 3A Chapter Notes -Unit, Exhaust Gas, Contact Force
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PHYSICS 3A Full Course Notes
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Document Summary
Consider an object that has no forces acting on it. If it is at rest, it iwll remain at rest. If it is moving, it will continue moving in a straight line st a constant speed. Wall slows down car seatbelt / airbag slow down dummy. Force : 9 push or pull (cid:8869) a force changes an object"s motion (cid:8869) a force must act on an object a force " " force " (cid:8869) a force requires an agent. Agent : something that pushes or pulls (cid:8869) must identify agent (cid:8869) can be an inanimate object (cid:8869) a force is a vector has magnitude and direction. I ] contact force : act on an object by touching it at a point of contact: long - range force : acts on an obvect without physical contact. Force vectors arrow points in direction of movement (cid:8869) (cid:8869) contact force long range force.