Download Forces I can part 2

Lesson 5
Match the words and the definitions by using arrows
Word
Definition
mass
the force of gravity pulling on an object
weight
the unit of mass
kilogram
the unit used to measure force
newton
a measure of the amount of matter in an
object
Gravity is an ___________ force. This means is that an object's gravity pulls other
objects toward it. The Earth's gravity naturally pulls us, and everything else, toward
the centre of the planet, which keeps us from drifting off into space.
A bag of sugar of mass 2kg weighs 20 Newtons on Earth.
What does this tell us about the force of gravity (weight) acting on each kilogram ?
_____________________
Mars has less gravity than Earth. Therefore if you were on Mars you'd weigh less
because the force of gravity wouldn't be as strong as it is here on Earth.
Does this mean you would suddenly be thinner on Mars?
_________
Why is this ?___________________________________________.
Lesson 6
The gravitational field strength depends on the force of gravity. On Earth it is 10
N/kg, but it varies depending on planet size. The Gravitational field on the moon is one
sixth of that on Earth.
Weight = Mass x Gravitational field strength.
Would you weigh more or less if you were on the moon ?
What would happen to your mass on the moon ?
____________________
_____________________
Work out the weights of these masses on Earth ( remember to include the units)
a) 6kg bag of potatoes
b) 24kg bag of cement
_____________
_____________
Can you work out what each item would weigh on the moon?
a) ______________
b) ______________
Lesson 7 /8
Write down five basic needs that living things depend on for survival .
1.
2.
3.
4.
5.
Describe how these needs are met by conditions which exist on Earth.
Forces Graph Drawing
You are a part of a science team investigating a newly found solar system
in our galaxy. You have been asked to display the data we have just
received in from the survey probe so that it is easy to compare the
planets. You are then asked to examine the possibility of life in the new solar
system. The new planets have been named and listed in the order from closest to
furthest from the star as:






Rigel
Sorbas
Vulcan
Talax
Kronos
Remus
1) The probe has given the following results as to the gravitational field of the planets in the solar
system. Display results in the form of a bar graph
Planet
Rigel
Sorbas
Vulcan
Talax
Kronos
Remus
Gravitational field (N/kg)
34
42
14
6
10
48
2) The planet Vulcan was chosen by the probe for further study. This included dropping different
weights on to the planet to closer investigate the gravity present on the planet. Display the following
results as a Line graph.
Mass (kg)
1
2
3
4
6
8
Weight (N)
12
24
36
48
72
96
3) Using the more accurate data, what is the gravitational field of the planet Vulcan?
4) One of your colleagues has pointed out the planet Kronos has the same gravity as
Earth and wants to know why the probe ignored the planet. What other factors
could have caused the probe to ignore the planet?