Chapter 9 Physics Exam Review

You can experience weight

A) in an accelerating elevator away from Earth. B) standing on Earth's surface. C) in a rotating habitat in space.

You experience weightlessness

A) in the absence of a supporting surface. B) in a freely falling elevator. C) momentarily when you step off a chair.

If the Sun were twice as massive

A) its pull on Earth would double. B) the pull of Earth on the Sun would double.

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?

A) the force on A B) the force on B

If an object is placed exactly halfway between Earth and the Moon, it would fall toward the

Earth.

Which is most responsible for Earth's ocean tides?

Moon

Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is

N/A

Which pulls on the oceans of Earth with a greater force?

Sun

If Earth's radius somehow increased with no change in mass, your weight would

decrease

If Earth's mass decreased to one-half its original mass with no change in radius, then your weight would

decrease to half

How far must one travel to escape Earth's gravitational field?

forget it; you can't travel far enough.

The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then

four times greater

According to Newton, the greater the masses of interacting objects, the

greater the gravitational force between them

The direction of a gravitational field is

in the same direction as gravitational attraction

If the mass of Earth somehow increased with no change in radius, your weight would

increase also

As two objects moving toward each other due to gravity get closer, the acceleration of each

increases

When the distance between two stars decreases by one-third, the force between them

increases to nine times as much

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

increases.

If the Moon had twice as much mass and still orbits Earth at the same distance, ocean bulges on Earth would be

larger

When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be

less.

If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be

lower.

If the Sun became twice as massive, your attraction to the Sun would double and your weight as measured on Earth would

not change

The main reason ocean tides exist is that Moon's pull is stronger

on water closer to it than on water farther away.

Which rocket would require more fuel?

one going from Earth to the Moon

The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes

one-fourth

According to Newton, when the distance between two interacting objects doubles, the gravitational force is

one-quarter.

Suppose the Moon had twice the diameter but the same mass and same orbital distance from Earth. In that case, the high tides on Earth would be

practically the same

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

quadruple

Earth is presently accelerating toward the Sun (centripetal acceleration). If the Sun collapsed into a black hole, this acceleration would

remain the same

When a star collapses to form a black hole, its mass 38

remains the same.

If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core), the stone will

speed up until it gets to Earth's center

The force of gravity acting on you will increase if you

stand on a planet with a shrinking radius

Newton discovered

that gravity is universal

If you jounce up and down on a bathroom scale, what varies on the scale reading is

the normal force

If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be

the same

Tidal forces in general are the result of

unequal forces acting on different parts of a body

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is

very weak.

Inside a freely-falling elevator, you would have no

weight

Inside a freely-falling runaway elevator, your

weight is zero

Your weight is the force

you exert against a supporting surface