Lesson 3, Topic 1
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# Gravity, Mass, Weight

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#### Topic Content:

• Meaning of Gravitational Force / Weight
• Meaning of Gravity
• Meaning of Mass
• Spring Balance
• Mass Vs. Weight
• Worked Examples

### What is Gravitational Force / Weight?

The weight of a body is defined as the force acting on a body due to acceleration or gravity. Therefore, the weight of a body is a measure of gravitational force on that body. The SI unit of gravitational force/weight is Newton (N).

Gravitational pull causes objects to have weight, and fall back to the earth when thrown up and it is what makes an object feel very heavy.

### What is Gravity?

Gravity is the force by which a planet or other body draws objects toward its centre. It is measured by the acceleration that it gives to freely falling objects. Its SI unit is m/s2 or ms-2.

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