AST 10G Lecture Notes - Lecture 2: Tidal Force, Tidal Acceleration, Orbital Period
Document Summary
Acceleration-velocity changing in anyway in speed, direction, both (slowing down, speeding, turn) Turning=change in direction, change in velocity turning is form of acc. Only way to change obj. momentum is to apply force to it. During a collision , obj. will transfer momentum to other obj. in collision. Net force-(overall force) acting on obj) represents the combined effect of all individual forces together. A change in momentum occurs only when the net force is not zero. Net force not zero causes obj. to accelerates-when obj. Spinning in one place-no overall velocity or momentum-but angular momentum. Angular momentum- circling/turning moment. , turns through 360* angle. Weight- (apparent weight) is the force that scale measures when stand on it. It depends both on the mass & forces (inc. gravity) acting on the mass. Free-fall- falling w/o resistance to slow you down. Free fall=weightless, not force put on scale/weight measurement. Gravity is what makes space ships orbit earth---astron.
