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Gravity, Mass, and Weight: A Quick Guide

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Master the basics of gravity, weight, and mass in ten concise slides.

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Indonesia

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Gravity, Mass, and Weight: A Quick Guide
 

Gravity, Mass, and Weight: A Quick GuideOnline version

Master the basics of gravity, weight, and mass in ten concise slides.

by windarti
1

What is Gravity?

Gravity is the force that attracts objects toward the centre of massive bodies like Earth. It determines how objects fall and stay grounded.

2

Weight vs. Mass

Weight is the pull of gravity on an object, measured in newtons (N). Mass is the amount of matter, measured in kilograms (kg).

3

The Weight Equation

On Earth, gravity strength is about 10 N per 1 kg. This gives the simple equation: W = m × 10 (N).

4

Calculating Weight

If a person has a mass of 75 kg, their weight is approximately 750 N on Earth using W = m × 10.

5

Mass Is Not Weight

Mass stays the same regardless of location, but weight changes with gravity. This explains why astronauts weigh less on the Moon.

6

The Surface Contact Force

The desk's contact force supports a resting object, balancing gravity. It equals the object's weight when the surface is stationary.

7

Weight vs. Surface Support

If the weight exceeds the support, surfaces may fail or objects sink. The balance between weight and contact force prevents motion.

8

Examples in Real Life

An elephant's weight distributes across four feet; the ground provides a matching contact force to keep it supported. This demonstrates weight and contact force in action.

9

Why Gravity Varies by Location

Gravity depends on mass and distance. Planets and moons differ, so weight varies with location while mass remains constant.

10

Summary & Quick Quiz

Recap: Gravity pulls, weight measures that pull, mass is how much matter you have. Quiz: If mass is 60 kg, what is weight on Earth? (W = 60 × 10 = 600 N).

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