Mass and Weight
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What is Mass?
Mass is a term that is used for measuring the amount of an object. It is measured in standard metric units. In metric units, two units of Mass are Gram and Kilogram. The formula which is used for calculation of Mass is given below: –
Mass = volume x density
Such as if volume and density are given. One can easily calculate the Mass of an object.
One can find out different metric units with the use of standard metric prefixes which are given below in the table.
Milligram (mg)  1/1000 gram or 0.001 gram 
Centigram (cg)  1/100 gram or 0.01 gram 
Decigram (dg)  1/10 gram or 0.1 gram 
Gram (g)  1000 milligrams 
Dekagram (dag)  10 grams 
Hectogram (hg)  100 grams 
Kilogram (kg)  1000 grams 
Metric ton(t)  1000 kilograms 
What is Weight?
Weight is a term that is used for measuring how heavy an object is. It is measured in the Standard customary units. The unit of measurement of Weight is that of force which in the International system is Newton.
The formula used for calculation of Weight is given below,
W = m x g
W è Weight of the object
m è mass of the object
g è acceleration of gravity
How Mass and Weight are different?
 The Weight of an object is changed as per the location. However, the Mass of an object cannot change with respect to location.
 Weight is measured on scale, whereas Mass is measured with the use of balance comparing of a known amount of matter to an unknown amount of matter.
 Mass is measured how something weighs and Weight is caused by gravity, so the Weight of the person on the moon is less than as compared to earth, whereas Mass remains the same.
Table of Weight (Mass)

Quiz
 The standard unit of weight is ___________?
 Kilogram
 Kilometre
 Centimetres
 Meters
Answers: Kilogram, is the correct answer because kilometre, centimetre, and meter are units of length.
 Find out how many grams in 5kilograms?
 50000 grams
 50 grams
 00 grams
 5000 grams
Answer: – 5000 grams, is the correct answer.
The mass (m) in grams is equal to mass (m) in kilograms (kg) time 1000. Therefore,
We know, 1 kg = 1000 g
m_{g} = m_{kg} x 1000
m_{g }= 5 x 1000 è5000 grams
 Newton is the unit of ____________.
 Time
 Weight
 Speed
 Mass
Answer: – Weight, is the correct answer.
 On the earth’s surface,the strength of gravity is 10 Newtons per kilogram. Now, find out the Weight of a car whose Mass is 1500 kg?
 150 newtons
 1500 newtons
 15000 newtons
 150000 newtons
Answers: – 15000 newtons, is the correct answer.
Using formula, Weight = Mass x Gravity
Weight of Car = 1500 x 10 è15000 newtons.
 On Moon, the strength of gravity is 1.6 newtons per kilogram. Now, if on earth astronaut has 80 kg of Mass. Calculate the Mass of astronauts on the Moon?
 90 kg
 100 kg
 80 kg
 160 kg
Answers: – 80 kg, is the correct answer because Mass cannot change with change in location. Therefore, the Mass of the astronaut remains the same on the moon.
 On which place the Mass of body be greatest?
 Jupiter
 Mars
 Sun
 None of the above
Answers: None of the above, is the correct answer because the Mass cannot change with location.
 The standard metric unit of mass is _____________?
 Newton
 Grams
 Kilograms
 Meters
Answer: Kilograms, is the correct answer.
 On earth the weight of 1 kg mass object is ________.
 7 Newton
 6 Newton
 8 Newton
 5 Newton
Answer: – 9.8 Newton,is the correct answer.
Mass (m) = 1 kg
Gravity (g) = 9.8 m/s^{2}
Weight = ?
Therefore, w = m x g
W = (1 kg) (9.8 m/s^{2})
 8 kg m/s^{2}è9.8 Newton
 What is the formula to calculate Weight?
 w = m x g
 w = m x f
 w = f x g
 None of the above
Answer: – w = m x g, is the correct answer. In the “w” stands for the Weight of the object, “m” stands for the Mass of object and “g” stands for gravitational acceleration.
 The Weight of 1 ball is 1 kg. Find out the Weight of 10 balls?
 10 kg
 20 kg
 5 kg
 8 kg
Answer: – 10 kg, is the correct answer.
Weight of 1 ball = 1 kg
Weight of 10 balls = 1kg + 1kg + 1kg + 1kg + 1kg + 1kg + 1kg + 1kg + 1kg + 1kg = 10 kg