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?Weight increases when mass increases according to the following

formula:

Weight (Newton) = Mass (kg) X gravitational field intensity (N/kg)

• Earth’s gravitational field intensity is approximately 10 N/kg.

• (Every 1 kg object on the earth’s surface is attracted towards its

center with a force of approximately 10 N)

Problems:

1- Calculate the weight of a man on the Earth whose mass is 50 kg.
The earth’s gravitational field intensity = 10 N/kg

The weight of the man on the Earth = Man’s mass (kg) X 10

50 X 10 = 500 Newton

2- Calculate the weight of a ball on the Earth whose mass is 500 gm.
The earth’s gravitational field intensity = 10 N/kg

The ball mass = 500 gm / 1000 = ½ kg
The ball’s weight on the Earth = its mass (kg.) × 10

= ½ × 10 = 5 Newton
3- A big box has a number of small balls that are similar in mass.

• The mass of one ball = 0.5 kg
• The weight of balls = 500 newton
• The earth’s gravitational field intensity = 10 N/kg
Calculate the number of small balls inside the box.
The weight of one ball = The mass of 1 ball X 10

= 0.5 X 10 = 5 newton
The number of balls = Weight of balls / weight of one ball

= 500 / 5 = 100 balls

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