Ch 7 Physics Test Review

Legend tells us that Newton realized that the idea of falling applies to

• apples

• the moon

• Both of these

• Neither of these

The concept of free-falling applies to

• apples

• the Moon

• the planets

• all of these

The moon remains in orbit while falling around the Earth due to its

• tangential velocity

• absence of speed

• centrifugal force to keep it up

• acceleration of 10m/s²

The force of gravity between two planets depends on

• planetary compositions

• planetary atmospheres

• rotational motion

• none of these

The force of gravity between two objects depends on their

• masses

• distances apart

• both of these

• none of these

If the sun was half as massive, its pull on Mars would be

• unchanged

• twice

• half

• four times as much

If the mass of the Sun and a planet that orbits the sun are both doubled, with the distance being the same, the force of gravity between them

• remains unchanged

• doubles

• quadruples

• increases by 8

If the distance between two planets doubles, the force of gravity between them

• remains unchanged

• is half

• is one-fourth

• increases by 4

The gravitational constant G in Newton's law of gravity

• has units needed to allow the calculation of force

• indicates the strength of gravity

• changes the proportion form of the law of gravity to an exact equation

• all of these

The magnitude of G indicates that gravity is

• a relatively weak force

• a relatively strong force

• responsible for the orbiting of the planets

• responsible for all falling objects