Motion in the universe Flashcards
What is an universe?
The universe is a large collection of billions of galaxies.
What is a galaxy?
A galaxy is a large collection of billions of stars.
Which galaxy is our solar system in?
Milky Way
What does gravitational force (g) cause?
- Causes moons to orbit planets
- Causes planets to orbit the Sun
- Causes artificial satellites to orbit the Earth
- Causes comets to orbit the Sun
What are comets and how do they orbit?
They are lumps of ice and dust that elliptically orbit
How do planets and moons orbit?
They almost orbit circularly
What are asteroids and how do they orbit?
Lumps of rock that elliptically orbit
What is the equation for orbital speed?
Orbital speed = 2πr / T
r = Radius of planet (m)
T = Time period ie. time taken for 1 orbit (s)
Unit of mass
Kilogram (Kg)
Unit of length
Metre (m)
Unit of speed/ velocity
Metre/ second (m/s)
Unit of acceleration
Metre/ second^2 (m/s^2)
Unit of force
Newtons (N)
Unit of time
Second (s)
Unit of gravitational force
Newton/ kilogram (N/Kg)
What is the order for planets?
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune
How does gravitational mass relate with gravitational pull?
The larger the mass the greater the gravitational pull
What is the equation for weight (using weight, mass and gravity)?
Weight = mass x gravity
Is a direct proportion between distance from sun and the time taken for it to orbit?
The further the object is from the sun the longer it takes to orbit but it’s not directly proportional
