Force & Motion 3
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Transcript of Force & Motion 3
Force & Motion 3Force & Motion 3
Weight and MassWeight and Mass
Mass is the Mass is the measure of the measure of the inertia of an object inertia of an object and depends on and depends on the amount of the amount of matter the objects matter the objects containscontains
Weight and MassWeight and Mass
Weight is the force of gravity acting on an Weight is the force of gravity acting on an objectobject
Weight and MassWeight and Mass
An objects weight An objects weight is the product of is the product of the mass and the mass and acceleration due to acceleration due to gravity acting on itgravity acting on it
W = m W = m g g F = m F = m a a g = 9.8 m/s²g = 9.8 m/s²
Newton’s 3Newton’s 3rdrd Law Law
Whenever one object exerts a force on a Whenever one object exerts a force on a second object, the second object exerts an second object, the second object exerts an equal and opposite force on the first objectequal and opposite force on the first object
Newton’s 3Newton’s 3rdrd Law Law
Force exists in Force exists in pairspairs
Action and Action and ReactionReaction
Newton’s 3Newton’s 3rdrd Law Law
THINKTHINK
If a marble were If a marble were moving 100 times moving 100 times faster then a faster then a shopping cart, shopping cart, which would be which would be easier to stop?easier to stop?
Newton’s 3Newton’s 3rdrd Law Law
The action and The action and reaction forces do reaction forces do not always act on not always act on the same objectthe same object
Newton’s 3Newton’s 3rdrd Law Law
Momentum = the object’s mass Momentum = the object’s mass objects velocity objects velocity
M = m M = m v v
Measured in kg-m/secMeasured in kg-m/sec
Newton’s 3Newton’s 3rdrd Law Law
Conservation of momentumConservation of momentum If no net force acts on a system, then the If no net force acts on a system, then the
total momentum of the system does not total momentum of the system does not changechange
Newton’s 3Newton’s 3rdrd Law Law
Conservation of Conservation of momentummomentum
In a closed system, In a closed system, the loss of the loss of
momentum of one momentum of one object equals the object equals the
gain in momentum gain in momentum of another objectof another object