Science: Gravity Flashcards
What is gravity?
A force of attraction between 2 objects with mass
What is to exert
To apply (strength or effort)
True or false: everything that has mass exerts a gravitational force on other objects
True
2 objects will fall toward the ground at different speeds - why is that?
Air pushes against a falling object, and exerts a different force on objects with different mass.
If there was no air, all objects would be pulled down by gravity as the same speed.
How does the sun’s gravity affect our solar system?
The sun has huge mass, so it exerts a huge gravitational force. The sun’s gravity holds planets and other objects in orbit around it.
What are the 2 factors that the force of gravity between two objects depend depend on?
1) Mass: the heavier an object is, the more gravity force it has.
2) Distance: the closer an object is, the more gravitational force is exerted on that object.
If the mass of an objects is doubled, what happens to the force of gravity it exerts on another object?
The force of gravity also doubles.
If the distance between 2 objects is doubled, what happens to the force of gravity between them?
The force of gravity is quartered (reduced by 3/4)
What is the acceleration of gravity?
It is the acceleration experienced by an object as it falls due to gravitational pull
What is escape velocity?
It is the speed needed for an object to escape the gravitational pull of another object
Why does Jupiter have the highest acceleration of gravity and escape velocity among all planets?
Because it has the biggest mass of all planets.
The higher the mass of an object, the greater its gravitational force, and higher escape velocity is needed to escape its gravity.
Planet A has 3.7 m/s2 of acceleration of gravity, and Planet B has 9.8 m/s2 of acceleration of gravity.
If Mercury is one of the planets and other one is Earth, among Planets A and B, which one is Mercury?
Planet A, because it is smaller and has less mass than Earth, so it exerts less gravitational force than Earth.
