Mass Examples in Physics
Start with the recap, study the fully worked examples, then use the practice problems to check your understanding of Mass.
This page combines explanation, solved examples, and follow-up practice so you can move from recognition to confident problem-solving in Physics.
Concept Recap
The amount of matter in an object and a fundamental measure of how much it resists changes to its state of motion (inertia).
How 'heavy' something feels when you try to push it, regardless of gravity.
Read the full concept explanation →How to Use These Examples
- Read the first worked example with the solution open so the structure is clear.
- Try the practice problems before revealing each solution.
- Use the related concepts and background knowledge badges if you feel stuck.
What to Focus On
Core idea: Mass tells you how hard it is to change an object's velocity.
Common stuck point: Mass is not the same as weight. Mass is constant; weight depends on gravity.
Sense of Study hint: When solving a mass problem, first check whether you are given weight and gravitational acceleration. If so, use m = W/g to find mass. If given force and acceleration, rearrange Newton's second law to m = F/a. Always remember mass is constant — it does not change with location.
Worked Examples
Example 1
easySolution
- 1 Recall the relationship between weight and mass: W = mg, where W is weight, m is mass, and g is gravitational acceleration.
- 2 Rearrange for mass by dividing both sides by g: m = \frac{W}{g}
- 3 Substitute values: m = \frac{49}{9.8} = 5 \text{ kg}
Answer
Example 2
mediumPractice Problems
Try these problems on your own first, then open the solution to compare your method.