×

# Physics Doubt

If an insect inside a light, hollow ball moves inside it, the ball moves, thus the position of centre of mass of the ball changes. According to Newton's laws of motion, as long as no external force is applied to a body the centre of mass remains at rest. Then how this internal force changes the position of centre of mass of the body?

Note by Millon Das
2 years ago

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
• list
1. numbered2. list
1. numbered
2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$...$$ or $...$ to ensure proper formatting.
2 \times 3 $$2 \times 3$$
2^{34} $$2^{34}$$
a_{i-1} $$a_{i-1}$$
\frac{2}{3} $$\frac{2}{3}$$
\sqrt{2} $$\sqrt{2}$$
\sum_{i=1}^3 $$\sum_{i=1}^3$$
\sin \theta $$\sin \theta$$
\boxed{123} $$\boxed{123}$$

Sort by:

Because of gravity and friction, there's an external reaction force from the ground when the insect walks inside the ball. It's not any different from an insect walking directly on the ground.

To illustrate this point, let's imagine putting the light hollow ball on water so that it floats. As the insect walks inside the ball, what happens?

- 2 years ago

Because newtorns law is applicabe to point objects .

- 1 year, 6 months ago