Mid Term Revision

Question 1

Why do we have day and night

Answer 1

We have day and night because th Earth rotates on its axis. It takes 24 hours to do a full rotation. When the part is the Earth that we are on is facing the sun, it is day. When the part of the Earth that we are on is facing away from the sun, it is night.

Question 2

What makes a day 24hours long

Answer 2

It takes the Earth 24 hours to make a complete turn on its axis.

Question 3

What makes a year 365 days

Answer 3

The Earth takes 365 days to make one complete orbit of the sun

Question 4

What makes summer different from winter

Answer 4

In winter the suns energy is less concentrated as the northern hemisphere is tilted away from the sun whil in summer the suns energy is more concentrated as the northern hemisphere is tilted towards the sun

Question 5

When it is Winter in Britain, what season is it in Australia? Why?

Answer 5

Because the southern hemisphere where Australia is is tilted towards the sun while the northern hemisphere where Britain is, is tilted away from the sun

Question 6

What does a satellite orbit? What is the shape of that orbit?

Answer 6

They orbit planets in an almost circular orbit

Question 7

What does a comet orbit? What is the shape of that orbit?

Answer 7

Commits orbit the sun in a very elliptical orbit

Question 8

Why are the stars in May different from the stars we see in December?

Answer 8

The Earth completes its orbit around the Sun or its revolution in about 365 days total. As the Earth revolves around the Sun, the position of the Earth changes and this creates the different views of the night sky.

Question 9

Name three forces acting in this room, and one that doesn’t.

Answer 9

Gravity,air resistance and contact force there is no tension

Question 10

What three things about an object can a force change?

Answer 10

The shape of something
The speed
The direction it’s moving in

Question 11

What is Newton’s 1st Law of motion?

Answer 11

An object will remain as is unless it is acted on by an UNBALANCED FORCE

Question 12

A box has a 5N force acting on it pushing it to the left and a 4N force acting on it pushing to the right. Calculate the resultant force.

Answer 12

1N to the left

Question 13

A box has a 5N force acting on it pushing it down and a 4N force acting on it pushing it down. Calculate the resultant force.

Answer 13

9N down

Question 14

Why are racing cars flat and smooth?

Answer 14

So that they are streamlined and can ouch through the air fast

Question 15

If I want to reflect infra-red radiation when I go outside, what colour should my coat be?

Answer 15

Silver

Question 16

Removing the air from inside something creates a vacuum. Why is this hard to do in the lab?

Answer 16

Because their is air everywhere

Question 17

What causes water pressure on your goggles when you go underwater?

Answer 17

The goggles are pressing into your face because of drag/water resistance

Question 18

Why does a marshmallow grow when put in a vacuum?

Answer 18

Pressure in the marshmallows is caused by the particles colliding with the surfaces or sides. In the vacuum there is little or no pressure so the particles have more room to expand.

Question 19

If I put an object on a newtonmeter and get a reading of 32N, did I measure weight or mass

Answer 19

Weight

Question 20

Going to the moon would change which one: weight or mass? Why?

Answer 20

Weight because mass doesn’t change but weight is the force from gravity times g

Question 21

On Earth, what is gravitational field strength, g?

Answer 21

10 N/kg

Question 22

On Earth, what does a mass of 12kg weigh?

Answer 22

120N

Question 23

On Jupiter, where g=22 N/kg, what does the 12 kg weigh?

Answer 23

264

Question 24

What is the mass of an object with weight 4.5N on Earth

Answer 24

450g/0.45kg

Question 25

Where would I go if I wanted to be weightless, and why?

Answer 25

Deep space because their is no gravity there!

Question 26

What is the speed of an object that travels 100 metres in 20 seconds?

Answer 26

5 M/s

Question 27

What is the speed if it travels 100 metres in 1 minute?

Answer 27

100 M/m

Question 28

What equipment is needed to measure: Force? Temperature?
Distance?
Time?

Answer 28

Force newton meter
Temperature thermometer
Distance a measure tape/ruler
Time a stopwatch/timer

Question 29

What could be difficult about measuring force,temperature,distance or time?

Answer 29

The measuring device may be too small or not detailed enough measure small amounts