Chapter 9 Gravity

If a block is set sliding on a huge imaginary frictionless plane in contact with Earth's surface, it will NOT sustain a constant speed because A) a component of gravitational force parallel to the plane soon acts on it B) gravity gets weaker as distance increases C) it is not free from the shackles of Earth's gravity D) of its inertia

A) a component of gravitational force parallel to the plane soon acts on it

To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should A) buy at a high altitude and sell at a low altitude B) buy at a low altitude and sell at a high altitude C) it makes no difference

A) buy at a high altitude and sell at a low altitude

If the mass of Earth somehow increased with no change in radius, your weight would A) increase also B) decrease C) stay the same

A) increase also

The difference between Newton's Law as a proportion and an equation involves A) the constant G B) the equal sign C) one being a vector and the other not D) magnitude and direction

A) the constant G

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is A) very weak B) strong C) very strong

A) very weak

If Earth's radius somehow increased with no change in mass, your weight would A) increase also B) decrease C) stay the same

B) decrease

According to Newton, the greater the masses of interacting objects, the A) less the gravitational force between them B) greater the gravitational force between them C) greater the force between them by the square of the masses

B) greater the gravitational force between them

According to Newton,when the distance between two interacting objects doubles, the gravitational force is A) half B) one-quarter C) the same D) twice as much E) four times as much

B) one-quarter

Which pulls on the oceans of the Earth with the greater force A) moon B) sun C) both contribute equally

B) sun

Newton discovered A) gravity. B) that gravity is universal. C) neither of these

B) that gravity is universal.

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 C) both forces are the same

B) the force on B

Inside a freely falling elevator, you would have no A) gravitational force on you B) weight C) both of these D) neither of these

B) weight

Inside a freely-falling runaway elevator, your A) acceleration is zero B) weight is zero C) gravitational interaction with Earth is zero D) all of the above E) none of the above

B) weight is zero

Your weight is the force A) due to gravity B) you exert against a supporting surface C) equal to your normal force on any surface

B) you exert against a supporting surface

The universal gravitational constant G was first measured A) before Newton's time B) during Newton's time C) after Newton's time

C) after Newton's time

If the sun were twice as massive A) its pull on Earth would double B) the pull of Earth on the Sun would double C) both of these D) neither of these

C) both of these

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 A) twice B) three times greater C) four times greater D) none of the above

C) four times greater

As two objects moving toward each other due to gravity get closer, the acceleration of each A) decreases B) remains constant C) increases

C) increases

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space vehicle do not, because passengers in the space vehicle are A) beyond the main pull of Earth's gravity B) above Earth's atmosphere C) without support forces D) all of the above E) none of the above

C) without support forces

You can experience weight A) standing on Earth's surface B) in an accelerating elevator away from the Earth C) in a rotating habitat in space D) all of the above

D) all of the above

Your experience weightlessness A) in the absence of a supporting surface B) momentarily when you step off a chair C) in a freely falling elevator D) all of the above

D) all of the above

When the distance between two stars decreases by one-third, the force between them A) decreases by one-third B) decreases by one-half C) increases to twice as much D) increases to nine times as much E) none of the above

D) increases to nine times as much

Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is A) one-quarter B) half as much C) twice as much D) four times as much E) none of the above

E) none of the above