Chapter 4: Forces and Newton's Laws Flashcards

1
Q

force

A

push or pull

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2
Q

contact force

A

when things hit other things (physical contact)

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3
Q

non contact/ action-at-a-distance forces

A

forces exerted when things aren’t in direct contact

like gravity

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4
Q

mass

A

magnitude, NO DIRECTION
scalar quantity
used to measure inertia
kg

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5
Q

Newton’s First Law of Motion

A

objects continue at state of constant velocity (moving or still) unless compelled to change state by net force

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6
Q

net force

A

vector sum of all forces acting on a body

acts to CHANGE velocity NOT sustain it

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7
Q

inertia

A

Object’s tendency to stay at rest or stay in motion at constant velocity
measured by mass (object’s mass is quant measure of inertia)

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8
Q

Newton’s Second Law of Motion

A

when net external force acts on object w/ mass m, resulting acceleration is directly proportional to the net force and has a magnitude that is inversely proportional to the mass.

The direction of the acceleration is the same as the direction of the net force.

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9
Q

external force

A

forces envrionment exerts on object

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10
Q

internal force

A

forces one part of the object exerts on another

not included in the equation

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11
Q

Newton’s Third Law of Motion

A

for every action (force), there is an equal and opposite reaction

aka action-reaction law

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12
Q

types of forces (fundamental)

A

gravitational
strong nuclear
electroweak: forces exerted by electly charged paricles on each other

fundamental because can only be explained in terms of itself

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13
Q

two types of forces

A

fundamental
nonfundamental

pick up reading at 4.7

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