Gravitation Jeopardy Universal Law of Gravitation HistoryConceptualCircular Motion 10 20 30 40 50...
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Transcript of Gravitation Jeopardy Universal Law of Gravitation HistoryConceptualCircular Motion 10 20 30 40 50...
Gravitation JeopardyUniversal
Law of Gravitation
History Conceptual Circular Motion
10 10 10 10
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30 30 30 30
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50 50 50 50
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Part 1: Universal Law of Gravitation
10 Points – ULG
State Newton’s Law of Universal Gravitation.
Answer Main
10 Points Answer – ULG
• Any two objects that have mass will be gravitationally attracted to each other
MainQuestion
20 Points - ULG
State the mathematical equation for Newton’s Universal Law of Gravitation.
MainAnswer
20 Points Answer – ULG
Fgrav = Gm1m2/r2
Gravitational force = Gravitational constant*mass1*mass2/radius2
MainQuestion
30 Points - ULG
MainAnswer
• Determine the gravitational force exerted by cookie monster on a nearby cookie.– Mass of cookie monster: 200 kg– Mass of cookie: 0.3 kg– Distance between them: 5 m– G: 6.67 x 10-11
30 Points Answer – ULG
F = Gm1m2/r2
= (6.67x10-11)(200kg)(0.3kg)/(5m2) = 1.6 x 10-10 N
MainQuestion
40 Points – ULG
MainAnswer
• Sketch a graph of the gravitational force versus the distance between two objects (radius)
• And how are they related?– Proportional or Inversely Related
40 Points Answer – ULG
MainQuestion
• How are these two physical quantities related?- Inversely
proportional to the square of the distance
50 Points – ULG
MainAnswer
• How large does a planet have to be to attract you if you (70kg) were floating out in space approximately 250 m away? Assume it has to exert at least 10 N of gravitational force on you to pull you in.
50 Points Answer – ULG
• 1.33 x 1014 kg
MainQuestion
60 Points – ULG
MainAnswer
• Two planets are floating around in space, both 2 x 1023 kg. How far apart do they have to be to exert 100 N of force on each other?
60 Points Answer – ULG
1.63 x 1017 m apart
MainQuestion
Part 2: History
Main
10 Points – History
MainAnswer
• What does heliocentric mean?
10 Points Answer – History
Heliocentric:
“Sun – centered” with reference to a heliocentric solar system where the planets orbit the sun.
MainQuestion
20 Points – History
• Who was the credited with the idea of a geocentric solar system?
MainAnswer
20 Points Answer – History
• Ptolemy
MainQuestion
30 Points – History
• How were Copernicus and Galileo’s support of a heliocentric solar system different?
MainAnswer
30 Points Answer – History
• Copernicus came up with the idea of a heliocentric solar system but did not support it.
• Galileo was imprisoned for his support of the heliocentric model
MainQuestion
40 Points – HistoryDOUBLE JEOPARDY!!!
• Name three major facts about Tycho Brahe.
MainAnswer
40 Points Answer – History
• He had a midget• He had an elk that got drunk at parties• He had a gold nose• He was the king’s astronomer
• HE TOOK THE MOST ACCURATE MEASUREMENTS OF the solar system at that time
MainQuestion
50 Points – History
According to Newton, why would planets travel faster the closer they are to the sun?
MainAnswer
50 Points Answer – History
MainQuestion
• Newton explained Kepler’s laws by stating that the gravitational pull was responsible.
• If the planet is closer, it will have a stronger gravitational attraction and travel faster.
60 Points – History
• Which scientist sounds like something you would order at a restaurant?
• What was his greatest contribution?
MainAnswer
60 Points Answer – History
MainQuestion
• Cavendish
• Developed an experiment that validated the universal law of gravitation between objects on a human scale.
Part 3: Conceptual
Main
10 Points – Conceptual
Is the force of gravitation attractive or repulsive?
MainAnswer
10 Points Answer – Conceptual
• Attractive
MainQuestion
20 Points – Conceptual
Using Newton’s Universal Law of Gravitation, if the mass of one of the objects increases by 5, what happens to the force exerted between them?
MainAnswer
20 Points Answer – Conceptual
MainQuestion
• The force increases by 5.
30 Points – Conceptual
MainAnswer
• Using Newton’s Universal Law of Gravitation, if the radius between the objects increases by 5, what happens to the force exerted between them?
30 Points Answer – Conceptual
• The force decreases by 52
Or the force is 1/25 of the original force.
MainQuestion
40 Points – Conceptual
MainAnswer
• How does the gravitational force exerted by one planet in space on a second relate to the force exerted by the second planet on the first?
40 Points Answer – Conceptual
• The forces are equal (Newton’s Third Law) and opposite in direction.
MainQuestion
50 Points – Conceptual
• Using Newton’s Universal Law of Gravitation, if the radius between the objects decreases by 5, what happens to the force exerted between them?
Answer Main
50 Points Answer – Conceptual
• The force increases by 52
Or the force is 25 times the original force.
Question Main
60 Points – Conceptual
• Explain why planets orbit.• Sketch the force and velocity arrows at each
point in this diagram.
Answer Main
60 Points Answer – Conceptual
Question Main
• Planets orbit because the sun provides a centripetal force causing the planet to accelerate around it
• Velocity arrows are red – always tangent to the ellipse• Force arrows are green – always pointed toward the sun
Part 1: Circular Motion
10 Points – CM
What direction is the acceleration for an object spinning in a circle?
Answer Main
10 Points Answer – CM
• Towards the center of the circle
MainQuestion
20 Points - CM
Anna Litical is practicing a centripetal force demonstration at home. She fills a bucket with water, ties it to a strong rope, and spins it in a circle. Why does the water not fall out?
MainAnswer
20 Points Answer – CM
• Inertia keeps the water moving in a straight line, so the water “pushes against the back of the bucket” keeping it from falling out.
MainQuestion
30 Points - CM
MainAnswer
A 900-kg car moving at 10 m/s takes a turn around a circle with a radius of 25.0 m. Determine the acceleration and the net force acting upon the car.
30 Points Answer – CM
TOK:- m = 900kg- v = 10 m/s- r = 25.0 m
a = v2/r = 102/25 = 4 m/s2 F = ma = 900*4 = 3600 N
MainQuestion
40 Points – CM
MainAnswer
A tube is been placed upon the table and shaped into a three-quarters circle. A golf ball is pushed into the tube at one end at high speed. The ball rolls through the tube and exits at the opposite end. Describe the path of the golf ball as it exits the tube.
40 Points Answer – ULG
MainQuestion
Will leave the tube in the direction it was moving already (inertia)
50 Points – CM
MainAnswer
• You want to make a bowling ball travel in a circular counter-clockwise path around you (this means YOU are the center point). After you set the ball in motion “to the left”, in what direction will force need to be exerted to keep the ball in a circular path?
– You need to constantly push the ball away from you– You need to constantly push the ball toward you.– You need to constantly push the ball to the left
50 Points Answer – CM
• You want to make a bowling ball travel in a circular counter-clockwise path around you (this means YOU are the center point). After you set the ball in motion “to the left”, in what direction will force need to be exerted to keep the ball in a circular path?
– You need to constantly push the ball away from you– You need to constantly push the ball toward you.– You need to constantly push the ball to the left
MainQuestion
60 Points – CM
MainAnswer
Determine the centripetal force exerted upon a 40-kg child who makes 10 revolutions around the Cliffhanger in 29.3 seconds. The radius of the barrel is 2.90 meters.
60 Points Answer – CM
T = sec/rev = 29.3s/10rev = 2.93s
v = 2πr/T = 2π(2.90m)/2.93s = 6.2m/s
F = mv2/r = (40kg)(6.22 m/s)/(2.90m) = 533.4 N
MainQuestion
Physics CP Jeopardy
Gravitation and Circular Motion Review
Main