Download - Newton’s Second Law 46yq4
![Page 1: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/1.jpg)
Newton’s Second Law
http://www.youtube.com/watch?v=UyI3IL46yq4
![Page 2: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/2.jpg)
Do-NowO Write down what you remember from
the lab on Friday.O What is the relationship between
force and acceleration? What is the relationship between mass and acceleration?
![Page 3: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/3.jpg)
Force and Newton’s Second Law
O What is force?O Any push or pull
O When the force increases and the mass stays constant, the acceleration increases
O When the mass increases and the force stays constant, the acceleration decreases
![Page 4: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/4.jpg)
Newton’s Second Law
O Fnet = ma
O Fnet = force (in Newtons)
O m = mass (in kg)O a = acceleration (in m/s2)
![Page 5: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/5.jpg)
WeightO the effect of the
acceleration due to gravity
O Always directed downward
O Dependent on locationO Weigh more or
less on the moon? Why?
![Page 6: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/6.jpg)
MassO Amount of matter
in an objectO Constant for a
particular objectO Independent of
locationO Do you have a
different mass on the moon?
![Page 7: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/7.jpg)
Weight Equation
O Fg = mg
O Fg = force due to gravity (in Newtons)
O m = mass (in kg)O g = acceleration due to gravity (10
m/s2)
![Page 8: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/8.jpg)
Weight in an ElevatorO http://www.youtube.com/watch?v=2k-
2IlJcaHg
![Page 9: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/9.jpg)
Net Force and Acceleration
O Net force: the result of all forces exerted on an object
O If forces are exerted in the same direction, they are added
O If forces are exerted in opposite directions, they are subtracted
O Acceleration is always in the direction of the net force (largest force)
O If the Net force is zero, the object is not acceleratingO Can it be moving though?
![Page 10: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/10.jpg)
Free Body DiagramsO Drawing to help
understand forces
O Draw arrows away from the object to represent forces
![Page 11: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/11.jpg)
EquilibriumO When the
acceleration of the object is zeroO Net force is also
zeroO Two types
O Static: Object is not moving
O Dynamic: Object is moving at constant velocity
![Page 12: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/12.jpg)
Static ObjectsO If the net force is zero AND the
object is not moving, it is said to be staticO Weight pulls objects downO Normal force
O Supports them from fallingO Acts perpendicular to a surface
![Page 13: Newton’s Second Law 46yq4](https://reader036.vdocument.in/reader036/viewer/2022062404/551b21f0550346dd1a8b460a/html5/thumbnails/13.jpg)
And now your favorite professor…
O http://www.youtube.com/watch?v=_XJrY2sKfFQ