chapter9 Flashcards
What happens to the force of attraction between two planets when the masses of both are doubled?
force quadruples
What is the magnitude of the gravitational force between two 1-kg bodies that are 1 m apart?
6.67 × 10 -11 N
What is the magnitude of Earth’s gravitational force on a 1-kg body at Earth’s surface?
10N
How does the force of gravity between two bodies change when the distance between them is doubled?
The force decreases to ¼ of its initial value
Describe how the gravitational forces from the Sun and the Moon compare from one side of Earth to the other.
The Sun exerts a stronger force on the side of Earth nearest the Sun, and the Moon exerts a stronger force on the side nearest the Moon.
According to Newton, the greater the masses of interacting objects, the
greater the gravitational force between them.
According to Newton, when the distance between two interacting objects doubles, the gravitational force is
1/4
If Earth’s radius somehow increased with no change in mass, your weight would
decrease
If the mass of Earth somehow increased with no change in radius, your weight would
increase also
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?
both forces are the same
Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them
increases
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
1/4
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
When the distance between two stars decreases by one-third, the force between them
increases to nine times as much
A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above Earth’s surface. How much is her weight there?
100 N
Which is most responsible for Earth’s ocean tides?
moon