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Section 1

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Is the following sentence true or false? Circular motion is accelerated motion, which requires a force.

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Physics

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Last updated

7 years ago

Date created

Mar 1, 2020

Cards (36)

Section 1

(36 cards)

Is the following sentence true or false? Circular motion is accelerated motion, which requires a force.

Front

true

Back

Circle the letter of the fraction that compares the sun's contribution to ocean tides to the moon's contribution.

Front

1/2

Back

The constant G in this the universal gravitation law is called the-------- and describes the --------

Front

universal gravitation constant strength of gravity

Back

Newton realized that the moon must be falling -----------Earth.

Front

around

Back

The sun's pull on Earth is------ times greater than the moon's pull on Earth.

Front

180

Back

Circle the letter that identifies the fuel for the type of fusion that currently takes place in the sun.

Front

hydrogen

Back

the deviation of an orbiting object from its path around a center of force, caused by the action of an additional center of force

Front

pertubation

Back

Circle the letter of the sentence that describes the motion of a planet if its tangential velocity were reduced to zero. a. It would drift in space. b. It would continue in orbit at a slower speed. c. It would crash into the sun. d. It would spin away from the solar system.

Front

c.

Back

Field lines show the --------and of a-------- force field.

Front

strength and direction

Back

Why are there no large objects in the solar system today with very low tangential velocities?

Front

They long ago crashed into the sun.

Back

13. Is the following sentence true or false? Isaac Newton discovered gravity.

Front

false

Back

a force field that exists in the space around every massive body

Front

gravitational field

Back

Circle the letter of the inverse square of 9.

Front

1/81

Back

68. dark energy 69. dark matter 70. ordinary matter

Front

c. 73% b. 23% a. 4%

Back

When our sun no longer gives off heat and light, it will be a(n)

Front

black dwarf

Back

A cannonball fired with a small horizontal speed would follow a parabolic path and soon hit Earth. If the speed were faster, the path would be less curved and the cannonball would hit Earth farther away. At a fast enough speed, the path would become a circle and the cannonball would circle indefinitely.

Front

possible paths for cannon balls

Back

The pulls that Earth and the moon exert on each other is action at a distance because the bodies interact without

Front

being in contact

Back

Newton's theory of gravity confirmed the Copernican theory of the solar system.

Front

true

Back

19. Is the following sentence true or false? At the top of a mountain, your weight is slightly less than at ground level.

Front

true

Back

Is the following sentence true or false? The force of gravity is the strongest of the presently known four fundamental forces.

Front

false

Back

17. The English physicist---------- first measured G.

Front

Henry Cavendish

Back

what word that best describes the tangential velocity that prevents the moon from hitting Earth.

Front

sideways

Back

Gravity caused Earth to attract itself together before it became solid. Any "corners" of Earth have been pulled in so that Earth is a giant sphere.

Front

why the earth is round

Back

A tidal effect causes the solid surface of Earth to rise and fall as much as meter twice each day.

Front

one-quarter

Back

For any pair of objects, each object attracts the other object with a force that is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between their centers of mass.

Front

universal gravitation

Back

Is the following sentence true or false? The weight of a rock at Earth's center is zero.

Front

true

Back

Circle the letter that identifies the location where Earth's gravitational field is zero.

Front

at earths center

Back

An apple falls about 5 m in its first second of fall. The moon is about 60 times farther from the center of Earth than an apple at Earth's surface. The moon should fall 1/(60)2 of 5 m, or 1.4 millimeters in one second.

Front

calculation of the moon falling

Back

Is the following sentence true or false? The moon falls beneath the straight line it would follow if no force acted on it.

Front

true

Back

Newton understood the concept of----------- , developed by Galileo, that without an outside force, moving objects continue to move at constant speed in a straight line.

Front

inertia

Back

Is the following sentence true or false? Newton believed that the mass of the moon affects how it falls.

Front

false

Back

What is the equation for universal gravitation?

Front

F = G [m1m2/d2]

Back

According to legend, Newton saw an apple fall from a tree and realized that the moon falls toward Earth for the same reason an apple falls from a tree. They are both pulled by Earth's gravity.

Front

newtons discovery of gravity

Back

44. How often does a high tide occur?

Front

twice a day

Back

37. sitting still 38. accelerating downward 39. accelerating upward 40. falling freely

Front

b. normal weight d. less weight than usual c. greater weight than usual a. no weight

Back

Circle the letter of the orbiting body that was discovered in just half an hour because of a perturbation in the orbit of Uranus.

Front

neptune

Back