ap physics c i.b newton’s laws of motion. note: the net force is the sum of the forces acting on...
TRANSCRIPT
![Page 1: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/1.jpg)
AP Physics C I.B
Newton’s Laws of Motion
![Page 2: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/2.jpg)
![Page 3: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/3.jpg)
![Page 4: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/4.jpg)
Note: the net force is the sum of the forces acting on an object,
as well as ma.
![Page 5: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/5.jpg)
An object may accelerate in one dimension or two. ΣFx = max or
ΣFy = may
![Page 6: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/6.jpg)
Free body diagrams
![Page 7: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/7.jpg)
Ex. Two cases for a 0.20 kg hockey puck on a frictionless surface. Find the horizontal acceleration when a) F1 = 4.0 N b) F2 = 2.0 N and F3 = 1.0 N at 30.0º below the horizontal.
![Page 8: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/8.jpg)
Ex. Three students pull on a ring with the forces shown. The ring doesn’t move. What is the magnitude and direction of FB?
![Page 9: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/9.jpg)
![Page 10: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/10.jpg)
![Page 11: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/11.jpg)
Weight and Mass
![Page 12: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/12.jpg)
The normal force – the force a surface exerts on an object,
perpendicular to the surface.
![Page 13: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/13.jpg)
Tension – forces exerted by strings, ropes, chains, cables etc. Since these devices can only pull on an object and not push, the force of tension is
always away from the object.
![Page 14: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/14.jpg)
Which string experiences the most tension?
2m m
![Page 15: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/15.jpg)
Newton’s Third Law – When two bodies interact, the forces are always equal in magnitude but
opposite in direction. This is true whether the objects are
stationary, moving at a constant velocity or accelerating.
![Page 16: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/16.jpg)
Ex. For the system of blocks shown a) draw a free body diagram on each block b) find the acceleration of the hanging block c) and the tension in the rope.
![Page 17: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/17.jpg)
Ex. For the hanging block shown, find the tension in each rope.
![Page 18: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/18.jpg)
Ex. For the block shown find a) the tension in the rope and b) the normal force on the block.
![Page 19: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/19.jpg)
Ex. Apparent weight of a 72 kg person in an elevator given by the scale reading (normal force). Find the apparent weight when a) the elevator is at rest or moving at a constant velocity b) accelerating upward at 3.20 m/s2 and c) accelerating downward at 3.20 m/s2.
![Page 20: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/20.jpg)
Ex. For the blocks shown find a) the acceleration of the blocks and b) the force on block B by block A.
![Page 21: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/21.jpg)
Friction – the book on the table
• The book is pushed and released
• The book is pushed across the table at a constant velocity
• Pushing a stack of books
![Page 22: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/22.jpg)
The direction of friction
![Page 23: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/23.jpg)
Causes of friction and a couple of equations
![Page 24: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/24.jpg)
Ex. In 1960, the longest recorded skid marks (290 m) on a public road, the MI highway in England, were made by a Jaguar. How fast was the car moving at the moment it began skidding?
![Page 25: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/25.jpg)
Ex. A woman uses a rope to pull a loaded sled with a mass of 75 kg along a horizontal patch of ice at a constant velocity. The coefficient of kinetic friction between the sled runners and ice is 0.10 and the rope makes an angle of 42º with the horizontal. What is the tension in the rope?
![Page 26: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/26.jpg)
Ex. A coin rests on a book. When the book makes an angle of 13º with the table, the coin just begins to slip. What is the maximum coefficient of static friction between the coin and book?
![Page 27: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/27.jpg)
For blocks that are sliding without slipping, treat them as a system. That is, they accelerate together. For blocks that are slipping, treat them separately. They are not accelerating together. Draw an FBD to identify the frictional force on each block.
![Page 28: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/28.jpg)
Ex. Will the block slide if the applied force is 12 N, the coefficient of friction between the block and wall is 0.60 and the weight of the block is 5.0 N?
Fa
![Page 29: AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma](https://reader036.vdocuments.mx/reader036/viewer/2022070415/5697bfae1a28abf838c9c562/html5/thumbnails/29.jpg)
maam
mB = 3.0 kgmA = 1.0 kgFa = 12.0 N
Ex. Find the force on block B by block A.