#### Transcript of Unit 1 lesson 3 : Relation between mass and weight

The Object Mass

Weight = mass x 10

[Newton] (Kg)

Unit 1 lesson 3 : Relation between mass and weight

**Mass and weight**

Mr.ahmed Elbasha

Example

Example 2: A piece of rock is placed in a pan of double pans balance, the sum

of masses which are placed in the other pains 300 gm to make balance.

A. What is the mass of the piece of rock? What is the direction of the

effect of this mass?

B. What is the weight of the piece of rock? What is the direction of the

effect of this mass?

C. What is the effect of changing the place on both mass and weight of

the rock piece?

Answer: 1- The mass of the piece of rock=300 gm =0.3 kg.

Mass has no direction

2- Weight = mass (kg) x 10

= 0.3 x 10 = 3 Newton. Towards the center of the earth

3- Mass is constant but the weight changes from one place to another.

Examples

Example 1: An object’s mass on earth is equal to 6 kg. Calculate its weight on

the earth’s surface

Answer: Weight = mass (kg) x 10

= 6 x 10 = 60 Newton

2. The Planet Where The Object Exist

The weight of the object on the surface of the earth

differs

from the

weight of the same object on the Surface of the moon.

(Give reason)

The more the planet's mass, the more the gravitational force, the

more the object's weight.

What happens if:

There is no gravity on the Earth’s surface. لايٛخذ خبرثيخ

Answer

:

All objects on Earth’s surface don't have weight.

1. The Object Mass

W on Earth =

W on moon x 6

W on moon =

W on Earth / 6

Example

: An object whose mass on earth is equal to 6 kg. Calculate its

weight on the earth’s surface and on the moon.

Answer

Weight on earth = mass (Kg.) x 10

= 6 x 10 = 60 Newton

Weight on moon = W on Earth / 6

= 60 / 6 = 10 Newton

3. The Distance from the center of the earth

The earth gravitational force

decreases

as the body moves away from the

earth.

Give reason

: the weight of person in a plane is smaller than on Earth

Bec

. Weight decreases as distance increases

Mass And Weight

Full transcript