Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion.
Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your...
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Transcript of Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your...
![Page 1: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/1.jpg)
![Page 2: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/2.jpg)
Part 4 Newton’s Second Law of Motion
![Page 3: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/3.jpg)
Newton’s Second Law
• Acceleration is the rate at which your velocity (speed with direction) changes.
![Page 4: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/4.jpg)
Acceleration• A car can change its
velocity by speeding up, slowing down, or turning.
• If an object’s acceleration is zero, the object could be moving at a constant speed in a straight line or could be stopped.
![Page 5: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/5.jpg)
• To calculate acceleration, you divide the change in speed by the amount of time it takes for the change to happen.
![Page 6: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/6.jpg)
![Page 7: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/7.jpg)
Acceleration
• If an object speeds up, it has a positive acceleration.
• If it slows down, it has a negative acceleration.
What is the acceleration of the sailboat?
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Force, mass and acceleration
• Force causes acceleration, and mass resists acceleration.
• Newton’s second law relates the force on an object, the mass of the object, and its acceleration.
• Force causes acceleration, and mass resists acceleration.
![Page 9: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/9.jpg)
![Page 10: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/10.jpg)
• The stronger the force on an object, the greater its acceleration.– Force is directly
proportional to acceleration.
– If twice the force is applied, the acceleration is twice as great.
![Page 11: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/11.jpg)
• The greater the mass, the smaller the acceleration for a given force.– Mass is inversely
related to force.– An object with
twice the mass will have half the acceleration if the same force is applied.
![Page 12: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/12.jpg)
Applying the second law• Keep the following important
ideas in mind:
1. The net force is what causes acceleration.
2. If there is no acceleration, the net force must be zero.
3. If there is acceleration, there must also be a net force.
4. The force unit of newtons is based on kilograms, meters, and seconds
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Newton’s second law and gravity
• Gravitational force exists between all objects that have mass.
• An object is in free fall if it is accelerating due to the force of gravity and no other forces are acting on it.
• Objects in free fall on Earth accelerate downward at 9.8 m/s2, the acceleration due to gravity.
![Page 14: Part 4 Newton’s Second Law of Motion Newton’s Second Law Acceleration is the rate at which your velocity (speed with direction) changes.](https://reader036.fdocuments.in/reader036/viewer/2022081519/56649e375503460f94b275fc/html5/thumbnails/14.jpg)
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Universal gravitation
• Gravitational force exists between all objects that have mass.
• You do not notice gravity between ordinary objects because it takes a huge amount of mass to create enough force to notice.
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Universal gravitation• The force of gravity
between you and Earth is strong because the planet’s mass is huge.
• Newton’s law of universal gravitation says the strength of the force depends on the mass of the objects and the distance between them.
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Orbital motion• Newton’s second
law can be used to explain the motion of planets, moons, and satellites in orbit.
• The orbiting moon falls around Earth.
Can you kick a soccer ball into orbit?