Ch.14.forces and motion (week 2)
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This document discusses three types of non-contact forces: magnetic forces, electrostatic forces, and gravitational forces. It provides details on magnetic forces and how opposite poles attract and similar poles repel. It also explains that gravitational forces act between any two masses in the universe, and the force is stronger between larger masses like the sun and earth. Finally, it defines the difference between mass and weight, where mass is the amount of matter and weight is the gravitational force acting on an object that can vary in different gravitational fields.
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The bottles did not move because of inertia - their mass resists changes in motion. It is a real demonstration of inertia. To pull it off:
- The bottles are glued to the table, so they cannot slide when pushed.
- The person pushes on the table, not directly on the bottles, so the bottles feel less force than what appears.
- Quick camera cuts and angles are used to hide that the bottles are fixed in place. It's an illusion that fools the eye through clever filming.
So in summary, it uses inertia and camera tricks to create the illusion that the bottles are resisting the push through their own inertia alone.
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The bottles did not move because of inertia - their mass resists changes in motion. It is a real demonstration of inertia. To pull it off:
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- The person pushes on the table, not directly on the bottles, so the bottles feel less force than what appears.
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Variation (environmental and inherited), genes, Selective breeding, natural selection, Charles Darwin's theory of natural selection
Ch.6.reproduction in humans
Puberty is the stage of development when the human body becomes capable of reproduction. During puberty, hormones cause physical changes like growth of sex organs and secondary sex characteristics. For females, this includes breast development and the start of menstruation. For males, changes involve growth of the penis and testes and facial/body hair. The document provides information about the male and female reproductive systems and their functions in sexual reproduction and childbirth.
Ch.12.chemistry in everyday life
This document discusses various chemical reactions that occur in everyday life, including respiration, combustion, burning, explosions caused by dust, reactions with oxygen like rusting metals and food becoming rancid, and hand warmers. It explains the reactants and products of these reactions, as well as factors that can speed up or slow down the reactions. Prevention methods for rust are also outlined, and exothermic and endothermic reactions are defined.
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Force
Force can be a push or a pull that causes motion, stops motion, or changes the motion of an object. There are several types of forces including gravitational, magnetic, electrostatic, tension, and frictional forces. Gravitational force depends on the masses of objects and the distance between them. Weight is the gravitational force of attraction between an object and Earth. It changes depending on the object's distance from Earth's center and location on Earth. [END SUMMARY]
gravity.ppt
Gravity is a fundamental force that causes objects with mass to accelerate towards each other. Kepler determined that planetary orbits are elliptical rather than circular, and that planets move faster when closer to the sun. Newton realized that the force causing apples and the moon to move was gravity. His law of universal gravitation stated that the gravitational force between objects is directly proportional to their masses and inversely proportional to the square of the distance between them. Gravity creates gravitational fields around massive objects that other objects interact with. Tides are caused by differences in the moon's gravitational pull on the near and far sides of Earth.
3gravitation-181206145827 (1).pdf
The document discusses concepts related to gravitation including:
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2. Kepler's laws of planetary motion which describe the motion of planets around the sun, including that planets move in elliptical orbits with the sun at one focus.
3. The acceleration due to gravity on Earth is approximately 9.8 m/s2 and causes objects with mass to have weight, defined as the gravitational force on an object.
10 gravitation.pdf
1. The document discusses concepts related to gravitation including Newton's Universal Law of Gravitation, Kepler's Laws of Planetary Motion, gravitational force, and acceleration due to gravity.
2. Key points covered include Newton's inverse square law formula for gravitational force, Kepler's three laws of planetary motion, and definitions of free fall and acceleration due to gravity.
3. The document also discusses properties of gravitational force and provides examples to illustrate concepts like why objects on Earth do not continuously accelerate towards each other due to gravitational attraction.
Force
The document defines force and describes its key properties, including that it can start or stop motion, change speed or direction of motion, or change the shape or size of an object. It also defines different types of forces like gravitational, magnetic, electrostatic, tension, and frictional forces. The document explains that force is measured in Newtons and discusses action-reaction forces.
3gravitation-181206145827-converted.pptx
The document discusses concepts related to gravitation including:
1. Key figures who contributed to our understanding of gravitation such as Johannes Kepler and Isaac Newton. Kepler's laws of planetary motion and Newton's universal law of gravitation are summarized.
2. Properties of gravitational force such as it being the weakest force, attractive, and obeying an inverse square law.
3. How the gravitational force between celestial bodies causes tides, and details on lunar tides and their relationship to phases of the moon.
gravitation.pptx
1. The document discusses concepts related to gravitation including Newton's universal law of gravitation, Kepler's laws of planetary motion, acceleration due to gravity, mass, weight, thrust, pressure, and equations of vertical motion.
2. Key figures discussed include Johannes Kepler, Isaac Newton, and Archimedes. Newton developed the universal law of gravitation and Kepler described three empirical laws of planetary motion.
3. The universal law of gravitation states that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Gravitation
- Newton's third law states that every action has an equal and opposite reaction. While an apple attracts the Earth, the Earth's much greater mass means this force is negligible and the Earth does not move towards the apple.
- The universal law of gravitation states that every object attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
- This law explains important phenomena such as the Earth's gravitational force, the moon's orbit around Earth and Earth's orbit around the sun, and how the sun and moon cause ocean tides.
A2 gravitational field KYUEM Physics
Gravity is a mysterious force that attracts all objects with mass, even when far apart. Newton discovered that all objects accelerate towards Earth at 9.81 m/s2, and the moon accelerates towards Earth at 2.72 m/s2. Gravity is weak but exists between all objects, causing dust in space to come together to form stars and planets.
Fundamentals of Physics "Gravitation"
13-1 NEWTON’S LAW OF GRAVITATION
After reading this module, you should be able to . . .
13.01 Apply Newton’s law of gravitation to relate the gravitational force between two particles to their masses and
their separation.
13.02 Identify that a uniform spherical shell of matter attracts
a particle that is outside the shell as if all the shell’s mass
were concentrated as a particle at its center.
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force on a particle due to another particle or a uniform,
spherical distribution of matter.
13-2 GRAVITATION AND THE PRINCIPLE OF SUPERPOSITION
After reading this module, you should be able to . . .
13.04 If more than one gravitational force acts on a particle,
draw a free-body diagram showing those forces, with the
tails of the force vectors anchored on the particle.
13.05 If more than one gravitational force acts on a particle,
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vectors. etc...
Ppt Gravity
The document discusses the law of universal gravitation and gravity. It states that all objects with mass exert gravitational attraction on each other, and that the gravitational force depends on the masses of the objects and the distance between them. It also explains that while the Earth exerts a force we can feel, we cannot feel the force of nearer objects like desks because their force is smaller due to lower mass and closer proximity.
Universal Gravitation PPP
This document provides a detailed overview of universal gravitation and its discovery. It discusses how Kepler summarized astronomical data and formulated his three laws of planetary motion in the early 1600s. Newton then used thought experiments involving cannonballs to deduce that gravity causes objects to fall and that the force of gravity follows an inverse-square law, decreasing with the square of the distance between objects. The document also explains how Cavendish experimentally determined the gravitational constant G.
Gravity
- Isaac Newton first described gravity mathematically in 1666 and observed an apple falling from a tree, wondering what force caused it to fall towards Earth.
- Gravity is the force exerted by massive objects like Earth that attracts other objects towards its center. It keeps objects on Earth's surface from floating off into space.
- The strength of the gravitational force depends on the masses and proximity of the objects - larger masses that are closer together experience a stronger gravitational pull.
FORCE-1.pptx
Forces cause objects to speed up, slow down, change direction or shape. Force is measured in Newtons and can be contact forces like friction or non-contact forces like gravity. The overall force acting on an object from multiple forces is called the resultant force. Mass is the amount of matter in an object while weight is the force of gravity, so an object's weight can vary in different gravitational fields but its mass stays the same.
Ch 13 universal gravitation1
1) Newton reasoned that the moon and an apple fall due to the same force - Earth's gravity. The moon is falling toward Earth but has enough sideways velocity to remain in orbit.
2) Newton's theory of universal gravitation confirmed that gravity extends throughout the universe and follows an inverse-square law, decreasing in strength with distance.
3) Ocean tides are caused by differences in the moon's gravitational pull on opposite sides of Earth, with spring tides occurring during a new or full moon.
The forces
This presentation is an extremely amazing piece of information and it will tell you about forces and some very simple physics
Science class 10
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Forces and motion
The document discusses different types of forces including contact forces, normal force, tension force, spring force, frictional force, air resistance force, applied force, buoyant force, gravitational force, magnetic force, electrical forces, strong force, electromagnetic force, weak force, and gravitational force. It provides definitions and examples for each force and describes their characteristics such as how they are generated and their relative strengths. Key formulas related to these forces are also presented.
Forces
Forces have both magnitude and direction. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by an external force. Newton's second law relates the net force on an object to its acceleration using the formula F=ma. Newton's third law states that for every action there is an equal and opposite reaction. Gravity exists between all objects and increases with the mass of the objects and decreases with distance between them. Weight is the gravitational force on an object and depends on its mass and location. Tides are caused by the gravitational forces of the moon and the centrifugal force of the Earth's rotation creating bulges in the oceans.
The mystery of gravity
Gravity remains a scientific mystery. Gravity is a force that attracts objects with mass towards each other. Newton discovered that gravity is directly proportional to mass and inversely proportional to the distance between objects. Gravity formed planets and keeps atmospheres intact. While some theorize that Earth's magnetism causes gravity, there is no evidence of this - gravity and magnetism are separate forces, with gravity acting on all masses and magnetism dependent on specific material properties.
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Experimental techniques
This document discusses various techniques for purifying substances, including filtration, crystallization, distillation, and chromatography. It provides examples of how each technique works and the types of mixtures it can be used to separate. Key points include:
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Chromatography windows 8
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This document provides information about lab safety rules, common safety symbols seen in laboratories, and descriptions of various laboratory tools and equipment. It lists 10 lab safety rules but does not specify them. It also describes safety symbols for substances that are explosive, flammable, corrosive, toxic, radioactive, pose environmental dangers, or are oxidizing, gases under pressure, or health hazards. Finally, it provides the names, uses, and simple diagrams of common lab tools including test tubes, beakers, conical flasks, Bunsen burners, tripods and gauzes, clamps and stands, funnels and filter paper, round-bottom and flat-bottom flasks, separating funnels, and delivery tubes.
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The document discusses electric circuits and their components. It explains that an electric circuit requires a power source, conducting materials like wires, components that use the electricity such as light bulbs, and switches. It also describes how to draw circuit diagrams using symbols and discusses key circuit concepts like current, voltage, resistance, and Ohm's law. Ohm's law defines the relationship between current, voltage, and resistance in a circuit. The document uses examples like dimmer switches and defibrillators to illustrate these circuit principles.
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25 people and the planet part1
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26 people and planet part 2
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Ch.14.forces and motion (week 2)
- 3. MAGNETIC FORCE A magnet has a north pole and a south pole . If u bring two magnets and put their similar poles together, you will feel a force pushing your hands apart as they repel , the strength of the push increases as you bring the similar poles closer together . If you bring the opposite poles together, you will feel your hands being pulled together as the different poles attract , the strength of the pull increases as the poles get closer. A magnet can also exert a non contact – pulling force on iron , cobalt , steel or nickel. The strength of this force increases as the magnet and any of these magnetic materials are brought closer together.
- 4. GRAVITATIONAL FORCE Is a force between any 2 masses in the universe. The masses may be small : such as an ant and a pebble . Or may be very large : such as the sun and the earth . The gravitational force between small masses is very weak to have any effect on them. But the gravitational force between two large masses such as the sun and the earth is large enough to be very important . The gravitational force between the sun and all the planets is what holds the planets in their orbits.
- 5. MASS AND WEIGHT The gravitational force between an object on earth and the earth itself pulls the object down towards the center of the earth. This gravitational force is called the weight of the object . Mass : the measure of the amount of matter in an object. Weight : the pull of the earth’s gravity on an object . Example : an object may have a mass of 1 k.g , the pull of earths gravity on 1 kg is a force of almost 10 newtons The weight of the 1 kg mass is therefore 10 N.
- 6. GRAVITATIONAL FIELD The region in which a force acts is called a field . there is a gravitational field around the earth . On earth the pull on a mass of 1 k.g is 10 N Therefore the gravitational field strength is10 N The gravitational field on mars is 3 times less than the gravitational field on earth. Therefore a 1 k.g object that was 10 N on earth weights only 3.3 N on mars . Gravitational field strength = weight / mass
- 7. ■ The Mass of an object never changes wherever it goes in the universe but its Weight changes according to the gravitational force that is acting upon it.
- 8. The Mass of an object never changes wherever it goes in the universe but its Weight changes according to the gravitational force that is acting upon it.