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# Revision On Unit 1

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## Ahmed Hussein

on 10 August 2016

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#### Transcript of Revision On Unit 1

Revision On Unit 1
Write the scientific term ...
1- The amount of matter in an object. ( ……………… )
2- The force with which the body is attracted to the earth. ( ……………… )
3- The measurement unit of mass which is almost equal to a mass of liter of water. ( ……………… )
4- The measurement unit of weight which is almost equal to a mass 100 grams. ( ……………… )
5- A device that is used to measure the mass of chemicals in lab. ( ……………… )
6- A device that is used to measure the weight of an object.( ……………… )
problems
Problem (1):-
If an object's mass on earth = 30 kg
Calculate:-
1- It's mass on Moon.
2- It's weight on earth.
3- It's weight on Moon.
Problem 2
Problem (2):-
If your weight on earth = 600 Newton. Calculate your weight on the moon.
Problem 3
Problem (3):-
If an object's weight = 20 Newton. Calculate it's mass.
Complete the following ززز
1- Mass is measured by using ………….. , where as weight is measured by using …………..
2- If the weight of iron ball is 200 Newton, so it's mass equals …
3- The measuring unit of mass is ………….. or ………….. where as the measuring unit of weight is …………..
4- The ……………………..decreases when the distance between an object & the center of the earth increases.
5- …………..is the force by which a body is attracted to the earth.
6- The object's weight depends on ………….. , …………..………….. & …………..…………..…………..
7- Mass is a constant value & not affected by …………...
8- …………. is the amount of matter in an object.
9- …………..is the measuring unit of mass & equals to the mass of one paper clip.
10- …………..is the measuring unit of mass & equals to the mass of one liter of water.
11- Newton is the measuring unit of weight which equals …………..grams.
Mr.Ahmed Elbasha
1.Mass
2.Weight
3.Kilogram
4.Newton
5. Balance Scale
6.spring scale
1- Mass on moon = 30 kg
Because : the mass has fixed value
2- Weight on Earth = mass (kg) x 10
= 30 x 10 = 300 Newton
3- Weight on moon = W on Earth / 6
= 300 / 6 = 50 Newton
W on moon = W on Earth / 6
= 600 / 6 = 100 Newton
problem 4
Problem (4):-
If an object's mass = 200 gm. Calculate it's weight on both earth and moon surfaces.
We need to find Mass (m)
So ; m = w / 10
= 20 / 10
= 2 Kg
First step convert 200 gm to Kilogram
200gm = 200/1000=0.2 kg
Then;
Weight on Earth = mass (kg) x 10
= 0.2 x 10 = 2 Newton
Weight on moon = W on Earth / 6
= 2 / 6 = 0.333 Newton
1- Kilogam - Newton
2- 20 kilogram
3- Gram - kilogram - Newton
4-Weight
5-weight
6- The object mass - Distance from the object and the center of the earth - planet where the object exist .
7- Changing the place
8-Mass
9-Gram
Give reason for:-
1- The weight of an object is affected by its mass.
2- There is a relation between mass & motion.
3- The weight of a person on the earth is larger than its weight on moon.
4- An object's weight is affected by the distance being away from the center of the earth.
5- The moon's gravity is less than earth's gravity.
1- Because as mass increases the weight increases.
2- Because the more object's mass increases, the more difficult to change it's speed.
3- Because earth has greater mass & gravitational force than moon.
4- Because the gravity force decreases as the body moves away from the earth so it's weight decreases.
5- Because the mass of moon is less than that of earth & as mass of the planet increases it's gravitational force increases.