Weight, Mass, Gravity

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16 Terms

1
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What is gravity?

A force of attraction between all masses.

2
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When do you usually notice gravity?

When at least one of the masses is very large, like a planet.

3
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What are the two effects of gravity on a planet's surface?

It makes all things fall towards the ground and gives everything a weight.

4
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What is mass?

The amount of 'stuff' in an object; it stays the same everywhere in the universe.

5
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What is weight?

The force acting on an object due to gravity.

6
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What causes weight on Earth?

The gravitational field around Earth.

7
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What does gravitational field strength depend on?

Location — it's stronger the closer you are to the mass and stronger for larger masses.

8
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Does weight change with location?

Yes — it depends on the local gravitational field strength.

9
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Why does a 1 kg mass weigh less on the Moon than on Earth?

Because the gravitational field strength on the Moon is weaker (1.6 N/kg vs 9.8 N/kg).

10
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What unit is weight measured in?

Newtons (N).

11
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How is weight measured?

Using a calibrated spring balance or newtonmeter.

12
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What is the centre of mass?

The point where the mass of an object is concentrated and acts.

13
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What is the difference between mass and weight?

Mass is a scalar measured in kg; weight is a force measured in newtons and depends on gravity.

14
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What is the equation for weight?

Weight = Mass × Gravitational Field Strength (W = m × g).

15
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What is the gravitational field strength on Earth?

Approximately 9.8 N/kg.

16
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How are mass and weight related?

They are directly proportional — double the mass, and the weight doubles.