Chapter 4, Topic 1
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# Mass & Weight

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#### What is Mass?

Definition: It is the amount of matter in a body.

#### What is Weight?

Definition: It is the measure of gravitational force acting on a body.

#### Measuring Instruments

• Mass
– Beam Balance
– Electronic balance
• Weight
– Spring balance
– Force meter

#### What is the differences between mass and weight?

Answer: Mass is a scalar quantity whereas weight is a vector quantity [1m]. Mass is measured with a beam balance whereas weight is measured with a spring balance[1m].

### Classic Mass & Weight Questions

#### 1. Explain why a beam balance will give the same value of mass at different places for the same object.

• Bean balance measures the mass of the object and mass is constant and does not change from place to place.

#### 2. Explain why a spring balance may give different readings at different places when weighing the same object.

• Spring balance measures the weight of an object which depends on the different gravitational field strength at different places (usual referring to different planets). 