Page 95 - Primary Five Science

Weight and Mass

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Weight
The force exerted on a body by gravity. This is often expressed

in the formula W = mg, where W is the weight, m the mass of

the object, and g gravitational acceleration.
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The weight of an object is determined by the following;

1. The pull of the force of gravity

2. Size of the object

3. Material from which an object is made
The basic unit for weight is Newton (N).
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Mass

This is the quantity of matter in an object.

Mass is constant. The mass of a given object

The units for mass are grams (g) or kilograms (kg). Weight and

mass are both measured using the following instruments.

Mass Weight

Mass is constant (does not Weight changes on different

change ) planets (because there’s dif-

ferent gravity on different

planets)

Mass is measured in grams Weight is measured in New-

(g) ton (N)

Mass is a mount of matter in Weight is force due to gravity

an object