Physics

Question 1

What is meant by a day?

Answer 1

A day is the time taken for a planet to spin once around on its axis.

Question 2

What is meant by a year?

Answer 2

A year is the time take for a planet to complete one orbit around the sun.

Question 3

In the summer is the northern hemisphere tilted towards the sun or away from the sun?

Answer 3

It is tilted towards the sun.

Question 4

Why is it colder in Winter?

Answer 4

It is colder in Winter because the Northern hemisphere is tilted away from the sun.

Question 5

What is a Solar System?

Answer 5

A solar system is a star and all the orbiting bodies.

Question 6

Name the planets in our solar system starting with the one nearest the sun.

Answer 6

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Question 7

The moon does not give out light so why do we often see it at night?

Answer 7

Because the sunlight reflects off of the surface of the moon.

Question 8

Which planet in our solar system should be the hottest and why?

Answer 8

Mercury should be the hottest as it is the closest planet to the sun.

Question 9

9 a - an exolplanet:
9 b - the sun:
9 c - a star:
9 d - the universe:
9 e - a comet:

Answer 9

is any planet beyond our solar system.
the star in our solar system.
a gigantic ball of gas which radiates energy.
all observable space.
a ball of ice and dust on a long elliptical orbit around the sun.

Question 10

increasing in size:

Answer 10

planet, solar system, galaxy, universe.

Question 11

what is a light year and why do we need to use them?

Answer 11

distance travelled by light in one year, it helps us measure long distances.

Question 12

How long does it take light to reach us from the sun?

Answer 12

8 mins

Question 13

How is the weight of an object calculated?

Answer 13

w = mg (mass x gravity)

Question 14

What is the unit of weight?

Answer 14

N = Newtons.

Question 15

Calculate the weight of a dachshund of mass 5kg, if gravity on earth is 9.8N/kg

Answer 15

w= mg
w= 5 x 9.8
w= 49N

Question 16

A boy on earth, has a mass of 45kg, moon is 1.6

Answer 16

w= mg
w= 45 x 1.6
w=72N

Question 17

What is meant by the “habital zone” and what is it sometimes called?

Answer 17

has the right temp, not too hot, not too cold, for water to exsist. “goldilocks zone”

Question 18

What conditions are required for life on a planet?

Answer 18

food, water, suitable temp, oxygen.

Question 19

Why is it difficult for us to travel to mars?

Answer 19

takes many months to get there, so we would need to take food, have no oxygen supply and water on the space ship, wear space suits.