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Motion and Stability (PS2.A: Forces and Motion (Motion results from a…
Motion and Stability
PS2.A: Forces and Motion
Motion results from a change in forces when there is not equilibrium
Force = strength and direction
Forces affect orientation, motion, and shape
Multiple forces can act on an object at once
Newton's 3rd Law: For every action there is an equal and opposite reaction.
Newton's 2nd Law: Force = mass x acceleration (generally-applicable rule)
PS2. B:Types of Interactions
4 Interactions
4 Interactions
Weak
Nuclear interaction
Occur in the nucleus of an atom
Strong
Nuclear interaction
Occur in the nucleus of an atom
Gravity
Forces that attract
Electromagnetic
Can repel
or
attract
Objects do not need to be touching for forces to exist
All objects with mass are affected by gravity
PS2.C: Stability and Instability in Systems
(In)stability = balance or lackthereof in a system involving interactions
Changing + Repeated, Stable Changes: changes are made in the system but are made repeatedly so a pattern appears which allows for predictions to be made
Earth's orbit around the Sun
Stable + Unchanging: opposite processes are occurring that balance one another out
weight remains the same while eating and disposing of waste
Static + Unstable: introduce forces that can change the system
ball at the top of a hill
Stable System: external and internal forces balance out system
a weight hanging from a string
Systems operate to maintain homeostasis, but a balance is not always achieved
Different conditions within a system determine how the system operates (speed, temperature)