ASTR 170B2 Lecture Notes - Lecture 7: Momentum, Conservation Law, Ellipse
29 Sep 2017
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Laws of Motion: PTYS 170B 9/14/17
BONUS POINT: LECTURE WEDNESDAY OCT 4 7 to 8 pm
Newton's Law of Motion:
Law 1: the law of inertia
-Object in motion stays in motion at constant velocity if there's no force
acting upon it
-Object at rest will stay at rest unless acted upon by a force
-Object will move in the straight line at constant speed unless outside
force alters the direction or speed
!
Law of inertia example: parked cars remain parked, until (obvious)
!
Newton's second law
Law 2: The Second Law
!
(net) Force =(mass) x (acceleration)
(net) Force = rate of change of momentum
!
The second law defines the quantitative relationship between force,
acceleration, and mass
Written as a = Force/mass we see that:
--mass corresponds to an object's resistance to acceleration
--for the same mass, larger forces produce greater acceleration
!
Newton's Law's of Motion:
Law 3: The "Third Law"
-The action and Re-action law
-For every force there is always an equal and opposite reaction force
-Forces do not operate in isolation
-Throwing a ball produces a force back on the pitcher
-The sun moves in a tiny ellipse as the Earth goes around it
!
Three important "Conservation Laws"
!
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Bonus point: lecture wednesday oct 4 7 to 8 pm. Object in motion stays in motion at constant velocity if there"s no force acting upon it. Object at rest will stay at rest unless acted upon by a force. Object will move in the straight line at constant speed unless outside force alters the direction or speed. Law of inertia example: parked cars remain parked, until (obvious) Law 2: the second law (net) force =(mass) x (acceleration) (net) force = rate of change of momentum. The second law de nes the quantitative relationship between force, acceleration, and mass. Written as a = force/mass we see that: -mass corresponds to an object"s resistance to acceleration. -for the same mass, larger forces produce greater acceleration. For every force there is always an equal and opposite reaction force. Throwing a ball produces a force back on the pitcher. The sun moves in a tiny ellipse as the earth goes around it.
