Fundamental Forces
True or false- Centrifugal is not a real force
True
The gravitational force between two objects (mass1= 10 kg, mass2= 6 kg) is measured when the objects are 10 cm apart. If the 10 kg mass is replaced with a 20 kg mass and the 6 kg mass is replaced with a 12 kg, how does the new gravitational force compare to the first one that was measured?
4 times larger
(because 2 x 2=4)
List the inner planets
Mercury, Venus, earth, and Mars
What is the force necessary to make an object move in a circle. It is directed perpendicular to the velocity of the object, which means it points toward the center of the circle.
Centripetal force
Which is the weakest of the fundamental forces?
Gravitational force
The gravitational force between two objects (mass1= 5 kg, mass2 =2 kg) is measured when the objects are 10 cm apart. If the 5 kg mass is replaced with a 20 kg mass and the 2 kg mass is replaced with a 12 kg mass, how does the new gravitational attraction compare to the first one that was measured?
24 times larger than the older one
(because 4x6 =24)
List the outer plantes
Jupiter, Saturn, Uranus, and Neptune
Consider an object traveling in a circle as shown on the whiteboard. If the arrows indicate the direction of the circular motion, draw an arrow representing the direction of the object's velocity.
answer on board
Which is the strongest of the fundamental forces?
Stong Force
The gravitational force between two objects (mass1=10 kg, mass2=6kg) is measured when the objects are 10 cm apart. If the 10 kg mass is replaced with the 20 kg, and the 6kg mass is replaced with a 3 kg mass, how does the new gravitational force compare to the first one that was measured?
the gravitational force stayed the same.
(the gravitational force was multiplied by 2 and the divided by 2)
Which receives more insolation: Mars or Saturn?
Mars
Consider an object traveling in a circle as shown on the whiteboard. If the arrows indicate the direction of the circular motion, draw an arrow indicating the centripetal force the object experiences.
answer on board
Which two forces are really different aspects of the same force?
the electromagnetic force and the weak force
The gravitational force between two objects (mass1= 1 kg, mass2= 2 kg) is measured when the objects are 10 cm apart. The objects are then replaced with two different ones (mass1= 4 kg, mass2= 1 kg), and the distance is decreased to 5 cm. How does the new gravitational attraction compare to the first one that was measured?
increased by a factor of 8
(the gravitational force is multiplied by 4, divided by 2, and multiplied by 4)
During what part of a comet's orbit are all three parts present?
when the comet is closest to the sun
What theory says that gravity is caused by the exchange of particles between objects with mass?
the Graviton Theory
Name the four different kinds of force in creation
gravitational force, electromagnetic force, weak force, strong force
The gravitational force between two objects separated by a distance of 5 cm is measured. Both objects are then replaced. the first object is replaced with one that has half of its mass, and the second object is replaced by one that has eight times its mass. What is the gravitational attraction now compared to when it was first measured?
four times larger than the original force
(because 1/2 x 8 =4)
Where do most physicists think short-period comets come from?
the Kuiper Belt
Suppose a scientist determines that there are only two fundamental forces in nature: the electroweak force and the strong force. Which of the two current theories of gravity does this mean is true?
The General Theory of Relativity
this theory states that gravity is not actually a force. It is simply a consequence of how mass bends space and time.