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Name the 4 fundamental forces in creation. What 2 forces are really different aspects of the same force.
gravitational force, electromagnetic force, weak force , and strong force
electromagnetic force and weak force
Which is the weakest fundamental force and what's the strongest?
- weakest: gravitational
- strongest: strong
Name the three principle of Newton's Universal Law of Gravitation.
1. all objects with mass are attracted to one another by the gravitational force
2. the gravitational force between two masses is directly proportional to the mass of each object
- 3. the gravitational force between two masses is inversely proportional to the square of the distance between those two objects
The gravitational force between 2 objects ( mass1= 10kg, mass2=6kg) is measured when the objects are 10 centemeters apart. If the 10 kg mass is replaced with a 20 kg mass and the 6 mass ois replaced with 12 kg how does the new gravitational force compare to the first one that was measured?
4 times larger than the old one
The gravitational force between 2 objects ( mass1=1kg, mass2=6kg) is measured when the objects are 10 centimeters apart. IF the distance between them is increased to 40 cm, how does the new gravitational attraction compare to the first one that was measured?
16 times smaller
The gravitational force between 2 objects ( mass1=1kg, mass2=2kg) is measured when the objects are 12 cm apart . If the 1 kg mass is replaced with a 5 kg mass, the 2 kg mass is replaced with a 4 kg mass, and the distance between the objects is reduced to 4 cm, how does the new gravitational force compare to the first one that was measured?
If venus orbits the sun because the sun exerts a gravitational force on it, what is the equal and opposite force required by newtons 3rd law?
venus exherts force on the sun
What kind of force is necessary for circular motion? Give the definition of that force.
centripetal force: the force used to make an object go in a circle. directed by the peroendicular to velocity of an object which means it points to the middle of the circle.
What are 3 principles of circular motions
1. circular motion requires centripetal force
2. the large the centripetal force the faster the object travels in a circle of a given size
3. at a given speed the larger the centripetal force the smaller the circle.
In an Olympic event called the "hammer throw", an athlete twirls a massive ball on the end of a wire. Once he gets the ball twirling very quickly, the athlete releases the wire, allowing the ball to fly straight out into the field. The person who throw the ball the farthest this way is the winner.
a. As the athlete twirls a ball faster and faster, will the wire have to apply more,less, or the same amount of centripetal force?
Suppose the athlete starts by gripping the wire close to the ball so the ball sweeps out a small circle. Then keeping the speed of the ball constant, he allows some of the wire to slip through his hands so the ball sweeps out a larger and larger circle. Will the wire exert more , less , or the same amount of force as the athlete makes his adjustments?
What is centrifugal force?
it's not a real force its nothing just a misunderstanding
List the inner and outer planets
inner: mercury, venus , earth, mars
outer: Jupiter, Saturn , Uranus, Neptune
List the planets of the solar system to closest to the sun to the furthest
Mercury , Venus , earth, Mars, Jupiter, Saturn, Uranus, Neptune
List the planets that have rings
Saturn, Jupiter, Neptune , Uranus
Where are most of the astroids in the solar system
What causes an asteroid to become a meteor?
perturbations in an astroid's orbit
What are the three parts of a comet? Which of those parts is always present?
nucleus, coma, tail
nucleus always stays
During what part of a comet's orbit are all three parts present?
when its close to the sun
Are the comets orbits circular or elliptical?
Where do most physicists think short- period comets come from?
What causes gravity according to Einstein's theory of general relativity?
gravity is caused by the fact that objects with mass bends time and space
What causes gravity according to the graviton theory?
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