Here is a summary of the notes I took on Newton's 2nd and 3rd Laws.
Newton’s 2nd Law
Newton’s 2nd Law
·
A=f/m
·
Relationship that shows force is prop. to
acceleration and mass is inversely prop. to acceleration
·
Inversely proportional: if mass increased by 2,
acceleration would DECREASE by 2
·
Proportional: if force is increased two times
greater, acceleration also increases 2 times more
Examples of 2nd Law
·
A ball hitting a wall and bouncing back
·
A hammer striking a nail into a piece of wood
and the hammer ”bounces” back
·
This picture shows how acceleration and mass are
inversely proportional, but force and acceleration are proportional
Newton’s 3rd Law
·
The force from the 1st object to the
2nd object is ALWAYS equal to the force from the 2nd
object to the 1st object
·
Even if only one object is pulling, force is
still equal
·
Dealing with two objects, not just one
·
Forces are separate for each object
Examples of 3rd Law
·
A person standing on a skateboard, pushes on a
wall, and accelerates backwards.
o
The wall is applying a force to you causing you
to move backwards
o
The person accelerates because only one force is
acting on the person
o
The force of the person pushing the was and the
table pushing back are independent of one another
·
This picture shows how a rocket is launched into
space using Newton’s 3rd Law
Review Questions to Remember
·
When skydiving, at what point is the net force…
o
0N?
§
When diving at a constant speed; terminal
velocity
o
-_N?
§
When free falling; before reaching terminal
velocity
o
+_N?
§
When the parachute has deployed
·
When skydiving, why is acceleration positive
when parachute is deployed?
o
To slow down, accel. must be in opposite
direction of velocity, and velocity is negative when skydiving, so accel. is
positive
·
If an astronaut is traveling alone in space and
needs to get back in the shuttle, how can he do this?
o
Push off of (or throw) tools he has with him in
opposite direction of where he needs to go
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