Mass and weight.




1 слайд
Unscramble the letters to form the
correct words.
S A M S
MASS
1 слайд
Unscramble the letters to form the correct words. S A M S MASS

2 слайд
Unscramble the letters to form the
correct words.
E G H I T W
WEIGHT
2 слайд
Unscramble the letters to form the correct words. E G H I T W WEIGHT

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Unscramble the letters to form the
correct words.
A G I R T V
Y
GRAVITY
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Unscramble the letters to form the correct words. A G I R T V Y GRAVITY

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Mass,
Weight and
Gravity
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Mass, Weight and Gravity

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Mass
Mass is the amount of matter
(stuff) an object is made up of.
The unit of mass is grams (g)
or kilograms (kg).
This is Gary.
Gary has a mass of
80kg.
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Mass Mass is the amount of matter (stuff) an object is made up of. The unit of mass is grams (g) or kilograms (kg). This is Gary. Gary has a mass of 80kg.

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Mass
Which bag has a greater
mass?
1 kg of
feathers
1 kg of
gold
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Mass Which bag has a greater mass? 1 kg of feathers 1 kg of gold

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Mass
The two balls in the picture are of the
same size.
The white ball is hollow but the red ball
is not.
Do you think they have the same
mass?
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Mass The two balls in the picture are of the same size. The white ball is hollow but the red ball is not. Do you think they have the same mass?

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Mass
How do we measure the mass of an
object?
weighing scale
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Mass How do we measure the mass of an object? weighing scale

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Weight
Weight is different from mass.
Weight is the measure of the
effect of gravity on the object.
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Weight Weight is different from mass. Weight is the measure of the effect of gravity on the object.

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Gravity
What will happen to the
ball after it is thrown up in
the air?
Why do objects fall onto
the ground when they are
released from a height or
thrown up?
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Gravity What will happen to the ball after it is thrown up in the air? Why do objects fall onto the ground when they are released from a height or thrown up?

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Gravity
Gravity is a force that
pulls the objects down,
towards the centre of
Earth.
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Gravity Gravity is a force that pulls the objects down, towards the centre of Earth.

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Weight
The unit of weight is Newton
(N).
Weight changes and depends
on gravity.
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Weight The unit of weight is Newton (N). Weight changes and depends on gravity.

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Mass vs. Weight
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Mass vs. Weight

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Weight
To calculate weight we use the
equation:
weight = mass × gravity
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Weight To calculate weight we use the equation: weight = mass × gravity

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Weight
weight = mass ×
gravity
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Weight weight = mass × gravity

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The Man on the Moon
The Man on the Moon
weighs 10kg. If he was on
Earth, he would weigh
more.
No, he would weigh the
same because he is made
of the same amount of stuff
as he was when he was on
the Moon.
What do you think?
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The Man on the Moon The Man on the Moon weighs 10kg. If he was on Earth, he would weigh more. No, he would weigh the same because he is made of the same amount of stuff as he was when he was on the Moon. What do you think?

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Mass vs Weight
Mass Weight
The amount of matter an object is
made up of.
The total amount of force acting
on an object due to gravity.
Measured in kilograms (kg). Measured in newtons (N).
The value does not change when
an object’s location changes.
The value does change when an
object’s location changes.
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Mass vs Weight Mass Weight The amount of matter an object is made up of. The total amount of force acting on an object due to gravity. Measured in kilograms (kg). Measured in newtons (N). The value does not change when an object’s location changes. The value does change when an object’s location changes.

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Activity
can be measured in
kilograms or grams
measured in newtons
What are the differences between mass and weight?
Mass Weight
a measure of the
effect of gravity
a measure of the
amount of matter
depends on gravity
does not depend
on gravity
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Activity can be measured in kilograms or grams measured in newtons What are the differences between mass and weight? Mass Weight a measure of the effect of gravity a measure of the amount of matter depends on gravity does not depend on gravity

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Term 1
Week 2
Day 2
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Term 1 Week 2 Day 2

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Mass,
Weight and
Gravity
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Mass, Weight and Gravity

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Review
True False
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Review True False

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Mass and weight are the
same.
True False
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Mass and weight are the same. True False

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Mass is the amount of
matter (stuff) an object is
made up of.
True False
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Mass is the amount of matter (stuff) an object is made up of. True False

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The unit of mass is
Newton (N).
True False
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The unit of mass is Newton (N). True False

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Mass changes and
depends on gravity.
True False
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Mass changes and depends on gravity. True False

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Weight is a force that
pulls the objects down,
towards the centre of
Earth.
True False
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Weight is a force that pulls the objects down, towards the centre of Earth. True False

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The unit of weight is
Newton (N).
True False
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The unit of weight is Newton (N). True False

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Weight is the measure of
the effect of gravity on
the object.
True False
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Weight is the measure of the effect of gravity on the object. True False

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We use a weighing scale
to measure mass.
True False
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We use a weighing scale to measure mass. True False

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To calculate mass:
mass = weight X gravity
True False
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To calculate mass: mass = weight X gravity True False

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Review
can be measured in
kilograms or grams
measured in newtons
What are the differences between mass and weight?
Mass Weight
a measure of the
effect of gravity
a measure of the
amount of matter
depends on gravity
does not depend
on gravity
34 слайд
Review can be measured in kilograms or grams measured in newtons What are the differences between mass and weight? Mass Weight a measure of the effect of gravity a measure of the amount of matter depends on gravity does not depend on gravity

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Weight
The unit of weight is Newton
(N).
Weight changes and depends
on gravity.
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Weight The unit of weight is Newton (N). Weight changes and depends on gravity.

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Mass vs. Weight
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Mass vs. Weight

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Weight
To calculate weight we use the
equation:
weight = mass × gravity
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Weight To calculate weight we use the equation: weight = mass × gravity

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Measuring Weight
Planet Weight (N) Mass (kg)
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
74
17.8
20
7.4
50
20.8
17.8
22.4
Gravitational Field
Strength (N/kg)
3.7
8.9
10
3.7
25
10.4
8.9
11.2
2
2
2
2
2
2
2
2
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Measuring Weight Planet Weight (N) Mass (kg) Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune 74 17.8 20 7.4 50 20.8 17.8 22.4 Gravitational Field Strength (N/kg) 3.7 8.9 10 3.7 25 10.4 8.9 11.2 2 2 2 2 2 2 2 2

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Weight
39 слайд
Weight