force
DESCRIPTION
FORCE. THIS PPT IS MADE BY SURESH KUMAR KV AFS ARJANGARH, NEW DELHI-110047. FORCES. What is a force?. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/1.jpg)
FORCE
THIS PPT IS MADE BY
SURESH KUMAR
KV AFS ARJANGARH, NEW DELHI-110047
![Page 2: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/2.jpg)
FORCES
![Page 3: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/3.jpg)
A force is an influence on a system or object which, acting alone, will cause the motion of the system or object to change. If a system or object at rest is subjected to a non-zero force it will start to move.
What is a force?
![Page 4: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/4.jpg)
Weight
Weight is a force caused (on Earth) by the gravitational attraction of a mass to the Earth’s centre.
The weight of a body, of mass m, is defined to be the force, W, with which it is attracted to the Earth.
On Earth, W = mg, where g is the acceleration due to gravity (g ≈ 9.81 m s−2 on Earth).
![Page 5: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/5.jpg)
Tension
Many mechanics problems involve objects being pulled, pushed or suspended from a string, spring, rod or something similar.
The force that the string (or similar) exerts on the object in these types of problems is called tension.
![Page 6: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/6.jpg)
Friction
A force that prevents, or tries to prevent, the slipping or sliding of two surfaces in contact.
![Page 7: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/7.jpg)
Air Resistance
Acts in the opposite direction to the motion.
![Page 8: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/8.jpg)
Normal reaction force
A mass lies on a horizontal surface. The weight of the mass pulls it downwards.The reason it does not fall is because the horizontal surface exerts an equal and opposite force on the mass called the normal reaction force.The normal reaction force always acts perpendicularly to the surface that is causing it.
![Page 9: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/9.jpg)
Example
A block lies at rest (not moving) on a rough inclined slope; what forces act on the block?
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Example
A ball, attached to the ceiling, is swinging on the end of a string in a simple pendulum motion; modelling the ball as a particle, what forces act on it?
![Page 11: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/11.jpg)
Example
What forces act on a trailer attached to a tow rope being pulled by a car?
![Page 12: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/12.jpg)
FORCES
![Page 13: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/13.jpg)
A force is an influence on a system or object which, acting alone, will cause the motion of the system or object to change. If a system or object at rest is subjected to a non-zero force it will start to move.
What is a force?
![Page 14: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/14.jpg)
Weight
Weight is a force caused (on Earth) by the gravitational attraction of a mass to the Earth’s centre.
The weight of a body, of mass m, is defined to be the force, W, with which it is attracted to the Earth.
On Earth, W = mg, where g is the acceleration due to gravity (g ≈ 9.81 m s−2 on Earth).
![Page 15: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/15.jpg)
Tension
Many mechanics problems involve objects being pulled, pushed or suspended from a string, spring, rod or something similar.
The force that the string (or similar) exerts on the object in these types of problems is called tension.
![Page 16: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/16.jpg)
Friction
A force that prevents, or tries to prevent, the slipping or sliding of two surfaces in contact.
![Page 17: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/17.jpg)
Air Resistance
Acts in the opposite direction to the motion.
![Page 18: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/18.jpg)
Normal reaction force
A mass lies on a horizontal surface. The weight of the mass pulls it downwards.The reason it does not fall is because the horizontal surface exerts an equal and opposite force on the mass called the normal reaction force.The normal reaction force always acts perpendicularly to the surface that is causing it.
![Page 19: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/19.jpg)
Example
A block lies at rest (not moving) on a rough inclined slope; what forces act on the block?
![Page 20: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/20.jpg)
Example
A ball, attached to the ceiling, is swinging on the end of a string in a simple pendulum motion; modelling the ball as a particle, what forces act on it?
![Page 21: FORCE](https://reader030.vdocuments.us/reader030/viewer/2022033102/56814fd2550346895dbd95b7/html5/thumbnails/21.jpg)
Example
What forces act on a trailer attached to a tow rope being pulled by a car?