Motion in the universe

Question 1

What is an universe?

Answer 1

The universe is a large collection of billions of galaxies.

Question 2

What is a galaxy?

Answer 2

A galaxy is a large collection of billions of stars.

Question 3

Which galaxy is our solar system in?

Answer 3

Milky Way

Question 4

What does gravitational force (g) cause?

Answer 4

• Causes moons to orbit planets
• Causes planets to orbit the Sun
• Causes artificial satellites to orbit the Earth
• Causes comets to orbit the Sun

Question 5

What are comets and how do they orbit?

Answer 5

They are lumps of ice and dust that elliptically orbit

Question 6

How do planets and moons orbit?

Answer 6

They almost orbit circularly

Question 7

What are asteroids and how do they orbit?

Answer 7

Lumps of rock that elliptically orbit

Question 8

What is the equation for orbital speed?

Answer 8

Orbital speed = 2πr / T

r = Radius of planet (m)
T = Time period ie. time taken for 1 orbit (s)

Question 9

Unit of mass

Answer 9

Kilogram (Kg)

Question 10

Unit of length

Answer 10

Metre (m)

Question 11

Unit of speed/ velocity

Answer 11

Metre/ second (m/s)

Question 12

Unit of acceleration

Answer 12

Metre/ second^2 (m/s^2)

Question 13

Unit of force

Answer 13

Newtons (N)

Question 14

Unit of time

Answer 14

Second (s)

Question 15

Unit of gravitational force

Answer 15

Newton/ kilogram (N/Kg)

Question 16

What is the order for planets?

Answer 16

MVEMJSUN
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune

Question 17

How does gravitational mass relate with gravitational pull?

Answer 17

The larger the mass the greater the gravitational pull

Question 18

What is the equation for weight (using weight, mass and gravity)?

Answer 18

Weight = mass x gravity

Question 19

Is a direct proportion between distance from sun and the time taken for it to orbit?

Answer 19

The further the object is from the sun the longer it takes to orbit but it’s not directly proportional