Share Science L6 Gravity and Inertia and Centrifugal forces
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What force causes earth to change its shape slightly? Centrifugal force OR Newtons force
Centrifugal force
What do planets have in common?
Round, orbit the sun, under influence of gravity
The greater an object the less its gravity. True or false
False
If an object is big enough what will happen? It will shrink or it will take up a shape
Take up a shape
Is earth a perfect sphere? Why or why not?
No, centrifugal force pulls it to the center
Why do you weigh less at the equator? Because you are closer to or further from the center of mass of the earth?
Further away so less gravity pulling you down
Everything with mass has inertia. True or false
True
Inertia will keep an object moving in a straight line or a new direction?
Straight line
How does inertia affect mass and mass affect inertia? The greater the mass the greater the inertia OR the smaller the mass the greater the inertia?
The greater the mass the greater the inertia
What 2 forces control movement of planets?
Inertia and gravity
The combined forces of inertia and gravity cause what about a planet? An elliptical orbit OR straight movement
Elliptical orbit
What shape would elliptical be? Round or oval or hexagonal
Oval
Do objects in space feel air resistance or not?
No
When an astronaut floats in space , what is this called?
Free fall
What must be balanced for a spacecraft to stay in orbit? Gravity and centrifugal force OR gravity and inertia
Gravity and inertia
What is the "trajectory" of an object?
Its path
